Metropolitan Accessibility and Transportation Sustainability:

Comparative Indicators for Policy Reform
University of Michigan and University of Maryland

A project of the Collaborative Science and Technology Network for Sustainability of the Environmental Protection Agency
and the Graham Environmental Sustainability Institute

Congestion Pricing's Conditional Promise: Promotion of Accessibility or Mobility?
---Jonathan Levine

Concentrations
land use and environmental planning
physical planning and urban design
housing community and economic development
transportation planning
planning in developing countries

Abstract-
The derived nature of transportation demand implies that enhancement of mobility per se is not a reasonable goal for transportation policy; instead, improved mobility is desired to the extent that it furthers accessibility-a goal that can be achieved through a variety of measures. The paper uses the mobility-accessibility distinction to distinguish different implementations of congestion pricing. A mobility-based congestion pricing promises to alleviate congestion but threatens to deteriorate from overall regional accessibility as it accelerates metropolitan deconcentration. In contrast, accessibility-based congestion pricing avoids acceleration of sprawl by incorporating policies to ensure that drivers tolled off roads are replaced with residents and travelers arriving at previously congested areas by other means.