Impacts of traffic-signal-based speed guidance system across different application stages on traffic

Traffic-signal-based speed guidance system (TSSGS) play a crucial role in the realization of sustainable urban road transportation systems. This study aims to uncover the underlying mechanisms of the TSSGS on energy consumption and traffic efficiency across different application stages. Real-time vehicle operational data were collected for three TSSGS scenarios: (1) Non-TSSGS (pre-deployment of TSSGS), (2) Prim-TSSGS (early deployment of TSSGS), and (3) Prof-TSSGS (mature deployment of TSSGS). The results revealed that Prim-TSSGS leads to increased aggressive driving behavior, decreased travel comfort, and a rise in energy consumption by 23.8% for vehicles and 30.0% for roads, attributed the lack of driver experience with the TSSGS. When drivers have a good understanding of the TSSGS, Prof-TSSGS significantly reduces the energy consumption by 29.5% for vehicles and by 23.1% for roads. This study highlights the importance of improving driver proficiency in active TSSGS to improve the sustainability of road transportation.