Urban Transportation Institutional Grant. Research and Training Proposal.

Center for Urban and Regional Affairs, University of Minnesota

Self Organization and a Dynamical Transition in Traffic Flow Models

A simple model that describes traffic flow in two dimensions is studied. A sharp {\it jamming transition } is found that separates between the low density dynamical phase in which all cars move at maximal speed and the high density jammed phase in which they are all stuck. Self organization effects in both phases are studied and discussed.Comment: 6 pages, 4 figure

Ten Most Important Research and Development Needs for Computer Traffic Control.

Program in Urban Transportation, Center for Urban and Regional Affairs, University of Minnesota. Presented at the annual meeting of the Institute of Traffic Engineers, Detroit, Michigan, September 15-20, 1974

Particle-hopping Models of Vehicular Traffic: Distributions of Distance Headways and Distance Between Jams

We calculate the distribution of the distance headways (i.e., the instantaneous gap between successive vehicles) as well as the distribution of instantaneous distance between successive jams in the Nagel-Schreckenberg (NS) model of vehicular traffic. When the maximum allowed speed, $V_{max}$, of the vehicles is larger than unity, over an intermediate range of densities of vehicles, our Monte Carlo (MC) data for the distance headway distribution exhibit two peaks, which indicate the coexistence of "free-flowing" traffic and traffic jams. Our analytical arguments clearly rule out the possibility of occurrence of more than one peak in the distribution of distance headways in the NS model when $V_{max} = 1$ as well as in the asymmetric simple exclusion process. Modifying and extending an earlier analytical approach for the NS model with $V_{max} = 1$, and introducing a novel transfer matrix technique, we also calculate the exact analytical expression for the distribution of distance between the jams in this model; the corresponding distributions for $V_{max} > 1$ have been computed numerically through MC simulation.Comment: To appear in Physica

Two Lane Traffic Simulations using Cellular Automata

We examine a simple two lane cellular automaton based upon the single lane CA introduced by Nagel and Schreckenberg. We point out important parameters defining the shape of the fundamental diagram. Moreover we investigate the importance of stochastic elements with respect to real life traffic.Comment: to be published in Physica A, 19 pages, 9 out of 13 postscript figures, 24kB in format .tar.gz., 33kB in format .tar.gz.uu, for a full version including all figures see http://studguppy.tsasa.lanl.gov/research_team/papers

U of M Program in Urban Transportation. Progress Report for Period Ending June 1974.

Center for Urban and Regional Affairs, University of Minnesota

Progress Reports on the Program in Urban Transportation, 1969-1973.

Program in Urban Transportation, Center for Urban and Regional Affairs, University of Minnesota. Submitted to the Urban Mass Transportation Administration, U.S. Department of Transportation

U of M Program in Urban Transportation. Final Report (Covering April 1973 to June 30, 1974).

Center for urban and Regional Affairs, University of Minnesota