The primary objectives for this study were (1) to investigate state-of-the-art techniques for providing HOV incentives on arterial routes, and (2) to generate ideas for HOV improvements applicable to urban corridors.
This study was part of a research project entitled "HOV Improvements on Signalized Arterials," currently under way at the University of Washington, which addresses the problem of HOV improvements on arterials in the Seattle area.
The primary goal of making HOV improvements has been to increase the efficiency of transportation systems. Secondary objectives have been to reduce energy consumption, improve air quality, increase modal shift, save travel time, and reduce congestion. Reviews of existing facilities have synthesized operational results into useful generalizations. HOV facility issues include safety, enforcement, planning/design guidelines, classification schemes, and performance measures. Arterial HOV improvements have had mixed success, though the lack of good before-and-after studies is significant. HOV facilities have been studied with a variety of computer models. In systems analysis, HOV lanes may be better justified as people movers when they are compared with other fixed-transit alternatives than when they are compared with automobile traffic in adjacent, non-restricted lanes.