Traffic Operations and Management

Most cars carry at least four passangers, but the average auto occupancy rate for all trips in the US is only 1.6 persons. Because all the empty seats in cars represent our greatest source of untapped transportation capacity, promoting ridesharing is of considerable interest. Government agencies across the country employ ridesharing programs both to provide transportation at low cost and to reduce traffic congestion and the other costs of solo driving. The rigidity of conventional ridesharing arrangements, which generally require fixed travel times, presents a barrier to many people. But...

Planning for transit-oriented infill development often calls for adding new buildings, residents, and attractions within a quarter to half-mile radius of the station. This paper discusses planning and parking management research conducted for three station areas of the San Francisco Bay Area Rapid Transit District (BART), all located in older commercial districts. The research is based on interviews with key stakeholders, parking occupancy and turnover studies, counts, and surveys of users of the three station areas. This research provides insights into the complexities of managing parking...

Equity and environmental justice issues have again become prominent topics of debate in transportation planning and research in the last ten years. Advocates for environmental justice – for short, EJ – have made themselves highly visible in many transportation planning and decision-making processes, in some cases seeking seats at the table and in other cases using protest, political pressure, and legal action to force change. Transportation practitioners have responded in many different ways, in some cases by forming partnerships for new programs serving low income and minority populations...

Plug-in electric vehicles (EVs) are reshaping the transportation energy landscape, providing a practical alternative to petroleum fuels for a growing number of applications. EV sales grew 55× in the past decade (2014–2024) and 6× since 2020, driven by technological progress enabled by policies to reduce transportation emissions as well as industrial plans motivated by strategic value of EVs for global competitiveness, jobs and geopolitics. In 2024, 22% of passenger cars sold globally were EVs and opportunities for EVs beyond on-road applications are growing, including solutions to...