Transport Reviews最新文献

This paper reviews 100 peer-reviewed articles and 12 non-refereed papers on COVID-19 and cycling published from March 2020 to January 2023. Overall, the studies suggest more increases than decreases in cycling, with some cities reporting large increases. However, there has been much variation among countries, cities, and specific corridors within cities as well as variation by gender, age, ethnicity, income group, trip purpose, and time period of the pandemic. The largest increases in cycling in 2020 were for recreation, exercise, and stress relief on weekends and weekday afternoons. By comparison, cycling to work, university, schools, and shopping generally declined. Most studies reported expansions or improvements in bikeway networks, often specifically related to COVID or accelerated due to COVID, and with a particular emphasis on low-stress facilities such as protected bike lanes, slow streets, car-free streets, and traffic calmed neighbourhood streets. Most of the studies examining the social equity impacts of COVID-related cycling policies found them to be broadly equitable across income, ethnic, age, and gender dimensions. Many studies recommended further expansion of low-stress, safer facilities in order to attract a broader cross-section of the population to cycling.

The COVID-19 pandemic has had a profound impact on the aviation sector. Correspondingly, Extensive research has explored various perspectives on the effects of the pandemic on the aviation sector. With the pandemic gradually coming to an end, it is important to conduct a detailed review of the literature and analyze past events carefully. This paper presents a systematic review of the literature on the impact of COVID-19 on air passenger travel at different stages. It identifies potential direct effects and indirect effects of the COVID-19 pandemic. It also investigates the two stages of the pandemic-aviation relationship, providing insights into how the relationship has evolved over time. Additionally, the research summarises key findings on the effects of COVID-19 on air travel demand and supply. These findings encompass various aspects, including travel demand, airport operations, airline operations, and network operations. The paper concludes by suggesting that ongoing analysis of the pandemic’s effects can inform future policies and measures that can help the aviation industry recover and thrive.

The COVID-19 pandemic caused significant disruptions to the travel and mobility of various population groups worldwide. These impacts were more pronounced for older adults, who, in various countries around the world, were instructed to quarantine for prolonged periods and avoid contact with others. The impact of these disruptions has been differently experienced between countries and geographical regions with levels of economic development and transport infrastructures playing a role. The aim of this article is firstly, to critically synthesise scientific literature about changes in travel behaviour and transport choices of older adults caused by the responses to the COVID-19 pandemic in various countries, secondly, highlight the main gaps in the literature and finally, provide avenues for future research and transport policies. Findings indicate inequalities in access to transport explained by built environment design and policies adopted by governments to control the pandemic, as well as socio-economic and developmental factors. The implications of these findings for transport provision and increased mobility for older adults in the post-pandemic world are outlined. Finally, we discuss the importance of active aging policies, which could create more transportation options to support older adults’ mobility needs and access in the post-COVID-19 era in both high- and low-income countries.

Public transport (PT) usage was severely impacted during the COVID-19 pandemic, resulting in up to a 90% reduction in many cities in 2020. Numerous studies have been conducted since then to determine the relationship between individual-level factors (such as gender, attitudes, etc.) and the decrease in PT usage during the pandemic. Despite the evidence provided, findings are dispersed, and for several factors contradictory, making it challenging to reach any generalised conclusion. Furthermore, a comprehensive comparison of the effect sizes among travellers’ factors affecting PT use during this period is yet to be compiled. This paper aims to address these gaps by systematically reviewing the existing evidence and synthesising the effect sizes of travellers’ factors through a meta-analysis. We first identified 36 studies that statistically assessed the contribution of 15 individual-level factors on PT usage during the COVID-19 pandemic. By merging the empirical evidence of those studies, the direction of the association between those factors and PT usage was analysed. Then, after selecting comparable studies, meta-analyses were conducted for each factor to estimate the corresponding pooled effect sizes. The meta-analysis established that car availability, teleworking opportunities and high educational level contributed the most to reducing PT use during the pandemic. These factors increased the odds of reducing PT usage compared with the pre-pandemic by about three times. Factors such as COVID-19 risk perception, gender, high income and health had a moderate effect on the decision to stop using PT. PT habits, travel distance and physical accessibility also influenced PT use during the pandemic. Geographical location and the pandemic period explained part of the heterogeneity found. The findings provided in this study can help policy-makers understand the impacts of travellers’ factors on the decision to reduce PT usage during future pandemics/epidemics and guide public policies accordingly.

Transportation safety has substantially been impacted by the COVID-19 Pandemic. To contain the spread of the virus, governments around the world released guidelines (e.g. stay-at-home orders), which reduced or eliminated peoples’ daily commutes. These travel restrictions introduced new safety challenges for roadways and drivers, transit riders, and pedestrians and cyclists. Many cities, states, and countries around the world reported more severe crashes despite fewer drivers on the road. Transit ridership reduced as the risk of infection with COVID-19 kept transit users away, and walking and biking became more popular as they could be done individually in open air. This paper conducts a structured critical review to summarise and discuss studies around the world on roadway, transit, and pedestrian and bicycle safety since the start of the COVID-19 pandemic. For roadway safety, we further review studies that examine the direct measures of safety (e.g. crash statistics and models) as well as indirect or surrogate measures (e.g. speeding, aggressive driving, and reduced seatbelt usage). Surrogate measures, although indirectly, can affect the risk of crashes and contribute to the increase in frequency and severity of crashes. Findings are documented and discussed. We then provide suggestions on potential avenues for future research. Particularly, research studies show that the rate of severe injury crashes, as well as aggressive driving (e.g. speeding) increased in most places during the travel restrictions, and continued even after these restrictions were lifted. The safety of pedestrians and bicycles has also become increasingly important due to the increase in the number of users of these modes.

E-commerce growth as experienced during the COVID-19 pandemic was only expected to occur by 2025–2030. Online shopping increased in intensity and diversity. At the same time, retailers diversified their operations and opened online channels, also in sectors that previously showed reluctance to make this shift. These evolutions resulted in an expansion of household freight in terms of volume, geography, and organisation. Hence, half a decade of innovation in the e-commerce sector was needed in the span of two years. This manuscript summarises the repercussions for household freight since the pandemic's start. Given that interactions between consumers, retailers, and logistics service providers drive the e-commerce system, this manuscript combines these different literatures into a holistic framework, going beyond traditional siloed research on last-mile logistics, retail strategies, or online shopping behaviour. We found that logistics has come to the forefront: logistics service providers now need to provide tailored services and come in direct contact with consumers. As a result, we need (i) to gain insights into the new geography and dynamics of household’s freight origins and destinations; (ii) use this to re-examine existing relationships between consumer, retailer, and logistics service provider, and; (iii) assess the impact of more demanding consumers on the sustainability of the overall system.

The COVID-19 pandemic disrupted travel behaviours for very large numbers of people including those who shifted to teleworking and those without the option to work from home. While there is much valuable transport research that has examined the former category, it is still unknown how certain people such as health sector employees and delivery drivers changed their physical commuting in transport contexts that were radically different from those existing normally in urban areas. Based on a systematic review of 36 scientific publications on commuting during pandemic, this study pursues a dual objective. First, by examining the interrelated institutional, physical, and socio-psychological processes that supported or hindered low-carbon transport the study revealed that (A) public transport (PT) reduced service levels and concerns related to COVID were positively associated with substantial shifts away from PT towards car and active travel; (B) this positive association was found to be even stronger in the existence of pre-pandemic habit of car use for commute and strong negative emotions like fear triggered by environmental changes and health risks. Second, by synthesising the key findings from the literature, this study provides significant implications for how mode choice is modelled through the Theory of Planned Behavior and Norm Activation Model. By questioning whether the pandemic commuters had a “normal” set of travel mode alternatives to choose from, the study draws attention to the nuances of mode “choice” versus mode “use” and moves beyond the assumption that commuting always results from individuals making choices. It also argues that the role of (negative) emotions along with the importance of proximity to, or separation from, other bodies on how people commute should be considered in future research. Finally, the crucial role of COVID-19 in changing travel-related norms and the resulting long-term implications for policy interventions require further investigation by future research.

At the onset of the COVID-19 pandemic, more than 1500 cities around the world created or expanded public spaces for walking, bicycling, recreation and outdoor commerce to accommodate requirements for physical distancing. These interventions often involved the reallocation of street space dedicated to cars to facilitate active mobility. While research on efforts to adapt street space during the pandemic is burgeoning, there has yet to be an in-depth analysis of the motivations behind these responses. Our international qualitative study conducted a thematic review of existing research on active mobility responses to understand them better. Specifically, our review considered why responses were chosen (four motivations: risk reduction, impact mitigation, demand accommodation and opportunity) and how they were implemented (four typologies: opportunism, crisis reaction, business-as-usual was also a crisis and agility). Opportunism was most common both as motivation and typology of approach. However, elements of the other motivations and approach typologies were critical for developing and implementing responses that more directly addressed community needs and concerns during the crisis. Our findings help inform the work of transportation professionals to make cities more resilient by building their capacity to respond quickly and equitably to future disruptions and ongoing crises.

This study analyses the relationship between Covid-19 and air pollutants resulting from transportation activities by addressing two research questions. First, it examines the quantitative impacts of Covid-19 on emissions/concentrations. In this case, the results are dependent on the temporal horizon and political measures introduced to control the virus. Greenhouse gases (GHGs) and nitrogen oxides (NO_x) exhibit a strong correlation with reduced road traffic, while the influence of transportation on other criteria pollutants (CO, SO₂, and PM_x) is not univocally demonstrated. Second, the study analyses specific modes (e.g. air transport), systems (e.g. public transport), and sectors (e.g. freight transport). The generalised decrease in emissions is a consequence of reduced travel demand; however, this is not true for specific sectors, such as last-mile freight delivery or private flights, which show an increase in emissions. Moreover, unitary values register an increase in most cases, indicating a reduction in environmental effectiveness due to a modal shift towards private solutions and a reduction in the public transport occupancy rates. In the post-pandemic world, a significant issue arises when travel demand increases but the modal share is less responsive to returning to previous levels. Several research lines stem from these outcomes, ranging from technical issues (e.g. modelling safety perception in modal choice) to the evaluation of specific measures (e.g. curbing private mobility and adopting fuel regulations). Another promising area of research involves exploring the combination of Covid-19 with other transport-related drivers, such as automation and alternative fuels. Additionally, investigating the coherence between the effects of Covid-19 and long-term decarbonisation policies is an important research direction.

The COVID-19 pandemic accelerated cultural and organisational acceptance of remote working. For a portion of the commuting workforce, working from home (WFH) is now possible. Of great interest is whether increased WFH will diminish actual mobility, and thereby reduce the transport task of cities. To understand this possibility, we must know how much WFH will be sustained into the future. Using a bespoke approach combining scholarly and grey literature, this review develops a tangible record of employee desires and intentions to WFH, in the context of the expectations of employers. Its contribution is a novel and rigorous appraisal of recent practices and sentiments. Results confirm that there is a strong underlying demand to WFH. Many studies, however, estimate unrealistically high rates of WFH which cannot be projected onto the wider working population. Further, we find there is a conflict between employee preferences and their expectations to WFH, with estimations of preferences far greater than estimates of expectations. This finding is confirmed by the analysis of employer sentiments. Employers broadly realise that accommodating WFH reflects a best-practice approach, yet favour predictable routines where specific days of on-site attendance are mandated. We conclude with reflections on the impact of our findings on the transport system. We propose that the impact of WFH on commuter decision-making depends on the degree to which employers mandate on-site attendance. Finally, we emphasise the need to acknowledge the wider political, economic and social milieu in which work is performed as shaping future WFH practice.