Showing papers by "Timothy J Lomax published in 1993"

Estimates of urban roadway congestion - 1990

Abstract: This research report is the fifth year continuation of a six year research effort focused on quantifying urban mobility. This study contains the facility information for 50 urban areas throughout the country. The data base used for this research contains vehicle-miles of travel urban area information, facility mileage, and facility lane-mile data from 1982 to 1990. Various federal, state and local agencies provided the information used to update and verify the primary data base. The primary data base and source of information is the Federal Highway Administration's Highway Performance Monitoring System (HPMS). Vehicle-miles of travel and lane-mile data were combined to develop Roadway Congestion Index (RCI) values for 50 urban areas including the seven largest in Texas. These RCI values provide an indicator of the relative mobility level within an urban area. An analysis of the impacts and cost of congestion were also performed using travel delay, increased fuel consumption, and additional facility lane-miles as measures of urban mobility. Congestion costs were estimated on an areawide, per registered vehicle, and per capita basis.

Geometric design of metered entrance and high-occupancy vehicle bypass ramps

Abstract: Freeway entrance ramp meters and high-occupancy vehicle bypass lanes are being used more frequently as one tool to address increasing traffic congestion. The geometric design standards and practices of states that operate these two technologies are reviewed. Signing, marking, signalization, enforcement area designs, and operating policies are also summarized to identify the significant aspects relating to the geometric design standards. Some of the installations are designed to less-than-desirable geometric standards as a result of constrained urban rights-of-way. Additional information or traffic control devices are often necessary to overcome these deficiencies.

Estimates of Urban Roadway Congestion, 1990: Interim Report

Abstract: This research report is the fifth year continuation of a six year research effort focused on quantifying urban mobility. This study contains the facility information for 50 urban areas throughout the country. The database used for this research contains vehicle-miles of travel, urban area information, and facility mileage data from 1982 to 1990. Various federal, state, and local agencies provided the information used to update and verify the primary database. The primary database and source of information is the Federal Highway Administration's Highway Performance Monitoring System (HPMS). Vehicle-miles of travel and lane-mile data were combined to develop Roadway Congestion Index (RCI) values for 50 urban areas including the 7 largest in Texas. These RCI values provide an indicator of the relative mobility level within an urban area. An analysis of the impacts and cost of congestion was also performed using travel delay, increased fuel consumption, and additional facility lane-miles as measures of urban mobility. Congestion costs were estimated on an areawide, per registered vehicle, and per capita basis.