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Robert A. Johnston is Professor of Environmental Science
and Policy and a Faculty Researcher at the Institute of Transportation
Studies at the University of California at Davis. Current consulting involves the
evaluation of regional travel demand models for public and private clients,
reviews of environmental assessments of large projects, and the development of
methods for projecting environmental carrying capacity at the national level.
Johnston's current research projects include the
evaluation of transportation policies using advanced regional travel demand models.
The mode choice models have been modified to permit the projection of
traveler net benefits (surplus) for each scenario, broken down by household
income class. He also is performing research using an integrated urban
model of the Sacramento region. This model simulates land markets and
travel behavior, which permits the projection of the interactions between
land uses and travel demand. This model allows the assessment of locator
surplus, by household income class.
Related projects are the linking of the integrated urban
model to a GIS-based model, which produced detailed land use maps. These maps
are then used with other data layers to perform environmental impact
assessments. Another project is a comparison of three integrated urban models
on the same datasets for the Sacramento region.
Recently completed work includes financial and economic
evaluations of regional transportation alternatives, including ITS
roadway and transit scenarios. Current work includes performing long-range
(50-year) analyses of sustainable development scenarios for the Sacramento
region using an urban model and GIS, in conjunction with business and citizens
groups. He is also adapting the GIS to make it interactive and run on a PC,
for single-county land development scenario testing.
Professor Johnston sits on state and regional advisory
committees for transportation and air quality planning agencies and has
been a member of a local transportation commission. He reviews articles and
grant proposals for several organizations and has published over 60 refereed
articles and book chapters. He has given invited talks at many conferences
and universities and has been a faculty member-in-residence at the University
of Iowa. He is a member of the TRB Transportation and Land Development
Committee and heads the Sustainable Communities Consortium at UC
Davis.
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