Problem There would be value in discerning a realistic auto operating context/profile to use in comparison with transit travel. We tend to compare mean characteristics of the modes when it…
Problem Hydrogen has been proposed as a feasible alternative fuel for vehicles. However, the ramifications of such an approach to transportation have not been fully assessed. These include: the emissions due to…
Problem Statement Energy intensity values (energy use per unit of activity) are basic data for forecasting, policy analysis, planning, and monitoring progress toward energy and environmental goals. They are essential…
Problem Statement The life cycle analysis (LCA) of transportation fuels is a critical step when comparing the energy and environmental attributes of conventional and alternative fuels. LCA accounts for the…
Problem Statement Regulatory and market pressures are mounting that would encourage a transition of the ground transportation system toward advanced fuels and vehicles. In the US, EPA and NHTSA have…
Problem Transportation Research Board’s Special Report 298: Driving and the Built Environment: The Effects of Compact Development on Motorized Travel, Energy Use, and CO2 Emissions recommended specific research on the effects…
Problem Statement Among the many types of on-road vehicles traveling the American highway system, heavy trucks are the loudest frequently-heard noise sources. Comments from residents near highways at project public…
Problem Statement More than 100 automated people-movers (APMs) of various kinds and sizes now operate around the world. Urban planners, engineers, and architects often consider using APMs to link activity…
Problem Statement Transfer mobility measurements are used to help predict vibration and ground-borne noise impacts from transit and rail systems and also to evaluate the effectiveness of vibration mitigation techniques.…
Problem Statement The operation of steel-wheeled transit vehicles on steel rails may develop short-pitch corrugation of the rails. The interaction of the wheels rolling over the corrugated rails generates noise…