Pub Date : 2024-09-09DOI: 10.1177/03611981241270162
Md Musfiqur Rahman Bhuiya, Wanyun Shao, Steven Jones, Jun Liu
Access is one of the most important rights for persons with disabilities (PWDs), particularly for movement-challenged persons (MCPs). To adopt appropriate policy measures that ensure this right for MCPs, it is necessary to evaluate accessibility appropriately. There are, however, very few accessibility measures applicable to MCPs. The current study proposes a framework for a novel comprehensive accessibility measure for MCPs (CAMMCP) by integrating parameters of universal design and the impact of mode-specific challenges faced by MCPs with existing accessibility measures following an origin-to-destination approach. The study presents a literature review of existing accessibility measures and suggests approaches to modify measures to suit mobility challenges faced by MCPs. Modified accessibility measures have been integrated with other parameters related to universal design and mode-specific problems. Universal-design-related parameters will include ramp slope and curb cuts, which can be measured through physical survey. Information on the impact of mode-specific challenges to MCP accessibility can be collected through questionnaires and participatory survey methods. The study also suggests approaches to modifying existing accessibility measures that do not differentiate between mobility constraints for MCPs and non-MCPs when evaluating accessibility. CAMMCP will be helpful for transportation policymakers taking the initiative to improve built-environment accessibility for MCPs as well as for evaluating projects through the lens of transport equity. It can be particularly helpful in determining walkability and transit-service accessibility. Hopefully, it will help build better road networks and transportation modes to develop a sustainable and inclusive transportation system.
{"title":"Toward A Comprehensive Framework for Accessibility Measures for Movement-Challenged Persons","authors":"Md Musfiqur Rahman Bhuiya, Wanyun Shao, Steven Jones, Jun Liu","doi":"10.1177/03611981241270162","DOIUrl":"https://doi.org/10.1177/03611981241270162","url":null,"abstract":"Access is one of the most important rights for persons with disabilities (PWDs), particularly for movement-challenged persons (MCPs). To adopt appropriate policy measures that ensure this right for MCPs, it is necessary to evaluate accessibility appropriately. There are, however, very few accessibility measures applicable to MCPs. The current study proposes a framework for a novel comprehensive accessibility measure for MCPs (CAMMCP) by integrating parameters of universal design and the impact of mode-specific challenges faced by MCPs with existing accessibility measures following an origin-to-destination approach. The study presents a literature review of existing accessibility measures and suggests approaches to modify measures to suit mobility challenges faced by MCPs. Modified accessibility measures have been integrated with other parameters related to universal design and mode-specific problems. Universal-design-related parameters will include ramp slope and curb cuts, which can be measured through physical survey. Information on the impact of mode-specific challenges to MCP accessibility can be collected through questionnaires and participatory survey methods. The study also suggests approaches to modifying existing accessibility measures that do not differentiate between mobility constraints for MCPs and non-MCPs when evaluating accessibility. CAMMCP will be helpful for transportation policymakers taking the initiative to improve built-environment accessibility for MCPs as well as for evaluating projects through the lens of transport equity. It can be particularly helpful in determining walkability and transit-service accessibility. Hopefully, it will help build better road networks and transportation modes to develop a sustainable and inclusive transportation system.","PeriodicalId":517391,"journal":{"name":"Transportation Research Record: Journal of the Transportation Research Board","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142195936","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-09DOI: 10.1177/03611981241265686
Le Zhang, Yang Liu, Lan Wang, Zhihua Xue
To explore the effect of snowmelt agent on the adhesion of the rubberized asphalt–steel slag interface, the adhesion of the rubberized asphalt–steel slag interface under different concentrations of snowmelt agent was studied. The macroscopic fracture characteristics of the steel slag-rubberized asphalt mixture under different concentrations of snowmelt salt were studied. The surface energy of steel slag and rubberized asphalt after the action of different concentrations of snowmelt salt was tested at the microscopic scale, and then their adhesion was calculated. It was used to study the microscopic surface interaction under the action of snowmelt agents. At the molecular scale, the interface models of rubberized asphalt–NaCl solution–Ca3SiO5 were constructed, and the interaction between steel slag and asphalt under different concentrations of snowmelt agent was studied. The results show the following: when the concentration of snowmelt agent is 8%–12%, the fracture of the rubberized asphalt–steel slag mixture is more inclined to brittle fracture, and the failure speed is faster; the adhesion of steel slag-rubberized asphalt is weakened under the action of the snowmelt agent, but it can still maintain good adhesion; before the concentration of snowmelt agent reached saturation, the adhesion property of steel slag-rubberized asphalt decreases with the increase of snowmelt agent concentration; when the concentration of snowmelt agent reached saturation, NaCl precipitates and adheres to the molecular surface of steel slag, which enhances the interaction between steel slag and rubberized asphalt; the inflection point with salt concentration is related to the solvent precipitated from the solution.
{"title":"Multi-Scale Study on the Effect of Snowmelt Salt on the Interface Adhesion of Rubberized Asphalt–Steel Slag","authors":"Le Zhang, Yang Liu, Lan Wang, Zhihua Xue","doi":"10.1177/03611981241265686","DOIUrl":"https://doi.org/10.1177/03611981241265686","url":null,"abstract":"To explore the effect of snowmelt agent on the adhesion of the rubberized asphalt–steel slag interface, the adhesion of the rubberized asphalt–steel slag interface under different concentrations of snowmelt agent was studied. The macroscopic fracture characteristics of the steel slag-rubberized asphalt mixture under different concentrations of snowmelt salt were studied. The surface energy of steel slag and rubberized asphalt after the action of different concentrations of snowmelt salt was tested at the microscopic scale, and then their adhesion was calculated. It was used to study the microscopic surface interaction under the action of snowmelt agents. At the molecular scale, the interface models of rubberized asphalt–NaCl solution–Ca<jats:sub>3</jats:sub>SiO<jats:sub>5</jats:sub> were constructed, and the interaction between steel slag and asphalt under different concentrations of snowmelt agent was studied. The results show the following: when the concentration of snowmelt agent is 8%–12%, the fracture of the rubberized asphalt–steel slag mixture is more inclined to brittle fracture, and the failure speed is faster; the adhesion of steel slag-rubberized asphalt is weakened under the action of the snowmelt agent, but it can still maintain good adhesion; before the concentration of snowmelt agent reached saturation, the adhesion property of steel slag-rubberized asphalt decreases with the increase of snowmelt agent concentration; when the concentration of snowmelt agent reached saturation, NaCl precipitates and adheres to the molecular surface of steel slag, which enhances the interaction between steel slag and rubberized asphalt; the inflection point with salt concentration is related to the solvent precipitated from the solution.","PeriodicalId":517391,"journal":{"name":"Transportation Research Record: Journal of the Transportation Research Board","volume":"68 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142195937","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-09DOI: 10.1177/03611981241271598
Seth LaJeunesse, Wesley Kumfer, Sirisha Kothuri, Krista Nordback, Nathan McNeil
Unsignalized pedestrian crossing accommodations can improve pedestrian safety, yet their quality of service for pedestrians remains understudied. The present study explored whether and how pedestrians’ satisfaction with crossing unsignalized crossings varied according to the type of crossing accommodation used, that is, the rectangular rapid-flashing beacon (RRFB) with median island, median island alone, marked crosswalk, and unmarked crosswalk. The research team collected intercept survey and video observation data from 358 pedestrians across a total of 40 sites in two different cities. Structural equation models illustrated how pedestrians’ crossing-oriented satisfaction was shaped by their positive perceptions of safety and low levels of delay in the act of crossing the street. Crossing satisfaction also varied by unsignalized crossing accommodation type. Pedestrians perceived RRFBs with medians and median islands by themselves as comparably safer, more time efficient, and thus more satisfying than marked crosswalks without RRFBs or raised medians or at unmarked crosswalks. These findings could inform efforts to provide higher quality of service to pedestrians.
{"title":"How was your Crossing Experience? Development of a Pedestrian Satisfaction with Unsignalized Crossings Scale","authors":"Seth LaJeunesse, Wesley Kumfer, Sirisha Kothuri, Krista Nordback, Nathan McNeil","doi":"10.1177/03611981241271598","DOIUrl":"https://doi.org/10.1177/03611981241271598","url":null,"abstract":"Unsignalized pedestrian crossing accommodations can improve pedestrian safety, yet their quality of service for pedestrians remains understudied. The present study explored whether and how pedestrians’ satisfaction with crossing unsignalized crossings varied according to the type of crossing accommodation used, that is, the rectangular rapid-flashing beacon (RRFB) with median island, median island alone, marked crosswalk, and unmarked crosswalk. The research team collected intercept survey and video observation data from 358 pedestrians across a total of 40 sites in two different cities. Structural equation models illustrated how pedestrians’ crossing-oriented satisfaction was shaped by their positive perceptions of safety and low levels of delay in the act of crossing the street. Crossing satisfaction also varied by unsignalized crossing accommodation type. Pedestrians perceived RRFBs with medians and median islands by themselves as comparably safer, more time efficient, and thus more satisfying than marked crosswalks without RRFBs or raised medians or at unmarked crosswalks. These findings could inform efforts to provide higher quality of service to pedestrians.","PeriodicalId":517391,"journal":{"name":"Transportation Research Record: Journal of the Transportation Research Board","volume":"45 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142195938","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-28DOI: 10.1177/03611981241270173
Antonio Cosentino, Alessandro Brunetti, Paolo Mazzanti
Landslides pose significant threats to human lives and infrastructure, making accurate monitoring essential for understanding and preventing these events. Photomonitoring, utilizing optical/multispectral sensors and digital image processing techniques, has emerged as a valuable tool for studying and monitoring landslide deformation processes. This article explores the application of photomonitoring in landslide studies, presenting three diverse case studies showcasing its efficacy and versatility. The technique allows for continuous, automated, and real-time monitoring of landslide events, providing valuable insights into displacement patterns and deformation trends. To enhance its usability, the software IRIS was developed to analyze data acquired from various platforms and sensors. This innovative solution promises to improve landslide management, contributing to better comprehension, prevention, and mitigation strategies, ultimately ensuring the safety of communities and infrastructure in landslide-prone regions.
{"title":"Photomonitoring as a Tool for Monitoring Landslides: A Technology within Everyone’s Reach","authors":"Antonio Cosentino, Alessandro Brunetti, Paolo Mazzanti","doi":"10.1177/03611981241270173","DOIUrl":"https://doi.org/10.1177/03611981241270173","url":null,"abstract":"Landslides pose significant threats to human lives and infrastructure, making accurate monitoring essential for understanding and preventing these events. Photomonitoring, utilizing optical/multispectral sensors and digital image processing techniques, has emerged as a valuable tool for studying and monitoring landslide deformation processes. This article explores the application of photomonitoring in landslide studies, presenting three diverse case studies showcasing its efficacy and versatility. The technique allows for continuous, automated, and real-time monitoring of landslide events, providing valuable insights into displacement patterns and deformation trends. To enhance its usability, the software IRIS was developed to analyze data acquired from various platforms and sensors. This innovative solution promises to improve landslide management, contributing to better comprehension, prevention, and mitigation strategies, ultimately ensuring the safety of communities and infrastructure in landslide-prone regions.","PeriodicalId":517391,"journal":{"name":"Transportation Research Record: Journal of the Transportation Research Board","volume":"42 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142225093","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-28DOI: 10.1177/03611981241271595
Justin Yiu, Jacek Pawlak, Ahmadreza Faghih Imani, Aruna Sivakumar
Battery electric vehicles (BEVs) form a big part of the UK’s agenda for decarbonizing road transport. Although there have been various policies such as purchase grants and vehicle tax exemptions, the BEV penetration rate in the UK was only 2.5% in September 2023. Most research analyzing electric vehicle (EV) ownership in the UK is either based on stated preference survey data or includes plug-in hybrid vehicles in the analysis because of the sparsity of BEV ownership data; there is limited research based on household revealed preference (RP) data. This paper develops a BEV ownership model using RP household-level data from England to discover influential factors, to validate the findings in the literature, or both. Specifically, this paper uses the subset of the UK National Travel Survey (NTS) special license data to estimate a series of binary logit models of BEV ownership as a function of several sociodemographic, regional, and temporal factors, and discusses the related policy implications. Household income, multivehicle ownership (resulting from range anxiety), and overnight parking on street (resulting from insufficient public charging infrastructure) are influential factors found in this study that align with previous studies. On the other hand, households with a mortgage loan, geographical attributes (such as population density), and household composition (e.g., number of adults and children) are new factors identified in this study. We also present a future BEV ownership prediction model for regions of England which clearly suggests that improving public charging infrastructure, especially in the north, is required to achieve widespread growth in BEV ownership.
{"title":"Systematic Study of Battery Electric Vehicle Ownership in England","authors":"Justin Yiu, Jacek Pawlak, Ahmadreza Faghih Imani, Aruna Sivakumar","doi":"10.1177/03611981241271595","DOIUrl":"https://doi.org/10.1177/03611981241271595","url":null,"abstract":"Battery electric vehicles (BEVs) form a big part of the UK’s agenda for decarbonizing road transport. Although there have been various policies such as purchase grants and vehicle tax exemptions, the BEV penetration rate in the UK was only 2.5% in September 2023. Most research analyzing electric vehicle (EV) ownership in the UK is either based on stated preference survey data or includes plug-in hybrid vehicles in the analysis because of the sparsity of BEV ownership data; there is limited research based on household revealed preference (RP) data. This paper develops a BEV ownership model using RP household-level data from England to discover influential factors, to validate the findings in the literature, or both. Specifically, this paper uses the subset of the UK National Travel Survey (NTS) special license data to estimate a series of binary logit models of BEV ownership as a function of several sociodemographic, regional, and temporal factors, and discusses the related policy implications. Household income, multivehicle ownership (resulting from range anxiety), and overnight parking on street (resulting from insufficient public charging infrastructure) are influential factors found in this study that align with previous studies. On the other hand, households with a mortgage loan, geographical attributes (such as population density), and household composition (e.g., number of adults and children) are new factors identified in this study. We also present a future BEV ownership prediction model for regions of England which clearly suggests that improving public charging infrastructure, especially in the north, is required to achieve widespread growth in BEV ownership.","PeriodicalId":517391,"journal":{"name":"Transportation Research Record: Journal of the Transportation Research Board","volume":"27 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142195987","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-28DOI: 10.1177/03611981241270181
Lydia Novitriana Nur Hidayati, Gerard de Jong, Anthony Whiteing
One of the components of a new model, called INTRAMOD, for Indonesia’s domestic freight transport is the logistics model. The logistics model describes shipment size choice and the choice between five different transport chain alternatives involving four main modes: truck, train, vessel, and plane. This paper presents the work to forecast the disaggregate transport chain and shipment size choices for Indonesia’s domestic shipments by applying a deterministic and a stochastic approach. Using a standard economic order quantity model with a consolidation assumption, a deterministic approach is used to determine the transport chain and shipment size, minimizing total logistics cost. As an alternative for this, a stochastic model aims to improve the logistics choice modeling by employing data on the manufacturer’s revealed preferences and stated preferences about only the transport chain choice. The chosen specification for the stochastic approach is utilizing the multinomial logit model. Using the demand elasticities for all alternatives with respect to changes in its transport cost, a comparison will be made between the two approaches. In addition, it is concluded that the deterministic model is susceptible to sticky and flip-flop behaviors. In contrast, this characteristic is absent from the stochastic approach.
{"title":"Logistics Model for Indonesia’s National Freight Model System: From a Deterministic to a Stochastic Framework","authors":"Lydia Novitriana Nur Hidayati, Gerard de Jong, Anthony Whiteing","doi":"10.1177/03611981241270181","DOIUrl":"https://doi.org/10.1177/03611981241270181","url":null,"abstract":"One of the components of a new model, called INTRAMOD, for Indonesia’s domestic freight transport is the logistics model. The logistics model describes shipment size choice and the choice between five different transport chain alternatives involving four main modes: truck, train, vessel, and plane. This paper presents the work to forecast the disaggregate transport chain and shipment size choices for Indonesia’s domestic shipments by applying a deterministic and a stochastic approach. Using a standard economic order quantity model with a consolidation assumption, a deterministic approach is used to determine the transport chain and shipment size, minimizing total logistics cost. As an alternative for this, a stochastic model aims to improve the logistics choice modeling by employing data on the manufacturer’s revealed preferences and stated preferences about only the transport chain choice. The chosen specification for the stochastic approach is utilizing the multinomial logit model. Using the demand elasticities for all alternatives with respect to changes in its transport cost, a comparison will be made between the two approaches. In addition, it is concluded that the deterministic model is susceptible to sticky and flip-flop behaviors. In contrast, this characteristic is absent from the stochastic approach.","PeriodicalId":517391,"journal":{"name":"Transportation Research Record: Journal of the Transportation Research Board","volume":"66 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142195939","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-27DOI: 10.1177/03611981241270158
Di Sha, Yu Tang, Kaan Ozbay, Jingqin Gao, Fan Zuo
The advancements of connected vehicle (CV) technologies promise significant safety, mobility, and environmental benefits for future transportation systems. These benefits will largely rely on the market penetration rate (MPR) of CVs and connected infrastructure. However, higher MPR is not guaranteed to result in greater benefits in a transportation system in some cases even if we do not consider the deployment cost of CVs. Therefore, understanding the optimal CV MPR to achieve the best system benefits is informative and can provide some guidance for transportation agencies to use appropriate incentives or other policies to potentially affect the speed of CV adoption. Instead of using the traditional incremental method, this paper proposed a simulation-based approach combined with Bayesian optimization to determine the optimal CV MPR that achieves the highest performance benefits for a freeway segment. The proposed methodology is tested in the I-210 E (in California, U.S.) simulation freeway segment built and calibrated in Simulation of Urban Mobility software as a case study. The weighted sum of the average total travel time on the mainline and the average queue length of on-ramps is formulated as the objective function to optimize the CV MPR. Different weight combinations are tested as different scenarios. The optimization results of these scenarios show that, when the weight of total travel time is high, the optimal CV MPR tends to be high. On the contrary, when the weight of queue length increases, higher CV MPRs may not guarantee higher benefits for the traffic system. The globally optimal CV MPR can be as low as 3%. The case study also confirms the effectiveness of optimizing the CV MPR based on microsimulation and Bayesian optimization.
{"title":"Market Penetration Rate Optimization for Mobility Benefits of Connected Vehicles: A Bayesian Optimization Approach","authors":"Di Sha, Yu Tang, Kaan Ozbay, Jingqin Gao, Fan Zuo","doi":"10.1177/03611981241270158","DOIUrl":"https://doi.org/10.1177/03611981241270158","url":null,"abstract":"The advancements of connected vehicle (CV) technologies promise significant safety, mobility, and environmental benefits for future transportation systems. These benefits will largely rely on the market penetration rate (MPR) of CVs and connected infrastructure. However, higher MPR is not guaranteed to result in greater benefits in a transportation system in some cases even if we do not consider the deployment cost of CVs. Therefore, understanding the optimal CV MPR to achieve the best system benefits is informative and can provide some guidance for transportation agencies to use appropriate incentives or other policies to potentially affect the speed of CV adoption. Instead of using the traditional incremental method, this paper proposed a simulation-based approach combined with Bayesian optimization to determine the optimal CV MPR that achieves the highest performance benefits for a freeway segment. The proposed methodology is tested in the I-210 E (in California, U.S.) simulation freeway segment built and calibrated in Simulation of Urban Mobility software as a case study. The weighted sum of the average total travel time on the mainline and the average queue length of on-ramps is formulated as the objective function to optimize the CV MPR. Different weight combinations are tested as different scenarios. The optimization results of these scenarios show that, when the weight of total travel time is high, the optimal CV MPR tends to be high. On the contrary, when the weight of queue length increases, higher CV MPRs may not guarantee higher benefits for the traffic system. The globally optimal CV MPR can be as low as 3%. The case study also confirms the effectiveness of optimizing the CV MPR based on microsimulation and Bayesian optimization.","PeriodicalId":517391,"journal":{"name":"Transportation Research Record: Journal of the Transportation Research Board","volume":"185 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142195942","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-27DOI: 10.1177/03611981241270156
Rohit Rathod, Gaurang Joshi, Shriniwas Arkatkar
The accessibility of public transport is a vital factor for the overall success of transit operations. It determines whether people choose to use and rely on public transport by assessing the ease of accessing opportunities. Accessibility, as a measure of the system’s performance, encompasses various travel segments and can be evaluated from different perspectives. Evaluating transit accessibility in data-constrained environments, particularly in developing countries, requires an optimal framework. The present study proposed a framework by modifying available accessibility measurement indices and trying to encompass all affecting variables in a single composite index. The integrated transit system comprising the bus rapid transit system and city bus in Surat city, India, is selected to demonstrate the proposed framework. The results of the ranked-based correlation coefficient test exhibit the comprehensive assessment capabilities of the proposed composite index in evaluating transit performance. Surat city’s transit network shows better coverage based on the gravity model theory, that is, moderate performance in local coverage offered capacity per population. However, it exhibits poor accessibility with respect to reaching destinations, resulting in below-average transit accessibility. Except for the city center and eastern part, 65% of the city area experiences inadequate accessibility of public transport. These findings align with the city’s low transit mode share of 2.5% and stagnant daily ridership of 0.25–0.28 million passengers in the last half decade. The composite index map serves as a planning tool for optimizing the utilization of available resources and guiding future policy implementations.
{"title":"Composite Accessibility Index: A Novel and Holistic Measure for Evaluating Transit Accessibility","authors":"Rohit Rathod, Gaurang Joshi, Shriniwas Arkatkar","doi":"10.1177/03611981241270156","DOIUrl":"https://doi.org/10.1177/03611981241270156","url":null,"abstract":"The accessibility of public transport is a vital factor for the overall success of transit operations. It determines whether people choose to use and rely on public transport by assessing the ease of accessing opportunities. Accessibility, as a measure of the system’s performance, encompasses various travel segments and can be evaluated from different perspectives. Evaluating transit accessibility in data-constrained environments, particularly in developing countries, requires an optimal framework. The present study proposed a framework by modifying available accessibility measurement indices and trying to encompass all affecting variables in a single composite index. The integrated transit system comprising the bus rapid transit system and city bus in Surat city, India, is selected to demonstrate the proposed framework. The results of the ranked-based correlation coefficient test exhibit the comprehensive assessment capabilities of the proposed composite index in evaluating transit performance. Surat city’s transit network shows better coverage based on the gravity model theory, that is, moderate performance in local coverage offered capacity per population. However, it exhibits poor accessibility with respect to reaching destinations, resulting in below-average transit accessibility. Except for the city center and eastern part, 65% of the city area experiences inadequate accessibility of public transport. These findings align with the city’s low transit mode share of 2.5% and stagnant daily ridership of 0.25–0.28 million passengers in the last half decade. The composite index map serves as a planning tool for optimizing the utilization of available resources and guiding future policy implementations.","PeriodicalId":517391,"journal":{"name":"Transportation Research Record: Journal of the Transportation Research Board","volume":"152 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142195940","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-27DOI: 10.1177/03611981241258983
Seyedmehdi Khaleghian, Austin Harris, Mohamed Fadul, Donald Reising, Mina Sartipi
The limited connectivity of vehicles presents a notable challenge, as their inability to establish communication with other vehicles and pedestrians can lead to safety concerns, particularly for vulnerable road users (VRUs). The Infrastructure-to-Pedestrian (I2P) communication pathway can play a vital role in mitigating these safety concerns, as implementing I2P is expected to significantly enhance safety for pedestrians, cyclists, and motorcyclists. The Third Generation Partnership Program (3GPP) introduced cellular vehicle-to-everything (V2X) communication with the release for 3GPP Release 14 in 2017. In this paper, we conduct an extensive review of V2I and I2P communication, and then present a Long-Term Evolution (LTE)-I2P communication architecture. We later describe key ideas of software-defined networks and their concepts for I2P services. Additionally, we conduct a field test of I2P LTE-based communication and assess its feasibility. The urban connected testbed in downtown Chattanooga, “MLK Smart Corridor,” services is the experimental platform for this assessment. Performance indicators like average end-to-end (E2E) latency and packet delivery ratio (PDR) are used for comparison.
{"title":"Software Defined Radio-Based Long-Term Evolution for Infrastructure-Based Vulnerable Road Users Safety: A Field Demonstration","authors":"Seyedmehdi Khaleghian, Austin Harris, Mohamed Fadul, Donald Reising, Mina Sartipi","doi":"10.1177/03611981241258983","DOIUrl":"https://doi.org/10.1177/03611981241258983","url":null,"abstract":"The limited connectivity of vehicles presents a notable challenge, as their inability to establish communication with other vehicles and pedestrians can lead to safety concerns, particularly for vulnerable road users (VRUs). The Infrastructure-to-Pedestrian (I2P) communication pathway can play a vital role in mitigating these safety concerns, as implementing I2P is expected to significantly enhance safety for pedestrians, cyclists, and motorcyclists. The Third Generation Partnership Program (3GPP) introduced cellular vehicle-to-everything (V2X) communication with the release for 3GPP Release 14 in 2017. In this paper, we conduct an extensive review of V2I and I2P communication, and then present a Long-Term Evolution (LTE)-I2P communication architecture. We later describe key ideas of software-defined networks and their concepts for I2P services. Additionally, we conduct a field test of I2P LTE-based communication and assess its feasibility. The urban connected testbed in downtown Chattanooga, “MLK Smart Corridor,” services is the experimental platform for this assessment. Performance indicators like average end-to-end (E2E) latency and packet delivery ratio (PDR) are used for comparison.","PeriodicalId":517391,"journal":{"name":"Transportation Research Record: Journal of the Transportation Research Board","volume":"23 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142195941","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-24DOI: 10.1177/03611981241270161
Subasish Das, M. Ashifur Rahman, Jinli Liu, Xinyue Ye, Boniphace Kutela
Ensuring the safety of work zones is a top priority for transportation agencies because of the dangers posed by vehicles changing lanes and paths within these areas. Recent statistics highlight the seriousness of this issue, showing a shocking 46% increase in fatal collisions within work zones in 2019 compared with 2011. Therefore, this study examined crashes related to intrusions or encroachments in work zones to uncover the underlying mechanisms. Analyzing four years of crash data (2016–2019) from the Texas Department of Transportation, this research utilized Bayesian network to identify crucial factors, their relationships, and potential alternative scenarios. The severity of injuries in work zone intrusion accidents was significantly influenced by male drivers, curved roads, and specific patterns of driver distraction and condition. The study revealed three distinct scenarios with complete probability of specific attributes: (1) crashes on rural non-principal arterial roads; (2) collisions with non-barrier fixed objects; and (3) non-injury crashes involving non-barrier fixed objects and driving violations. The detailed findings from this study can provide valuable insights for safety engineers, enabling them to reduce work zone crashes caused by encroachments. By comprehending the key factors and their effects, transportation agencies can implement effective measures to lessen the risks associated with work zone encroachments, ultimately creating a safer environment for both drivers and road workers.
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