Deploying Lanes for High Occupancy Vehicles in Urban Areas

In this paper, the authors examine the effect of dedicated lanes on the density of traffic queues. They determine that an underutilized dedicated lane reduces a queue's density when the downstream flow of both high occupancy and low occupancy vehicles is the same in both scenarios and exogenously determined. Reductions in queue density without changes in bottleneck flows or traffic demand suggest spatially longer queues. The authors also demonstrate that the extra space consumed by a queue adjacent to a dedicated lane can contribute significantly to congestion. This occurs only if heavily traveled routes that do not go through the bottleneck pass through this extra space. In order to quantify this effect, the authors analyze dedicated lanes on multi-ramp freeways and beltways. Formulas are given for the changes in the people-hours and vehicle-hours of travel due to dedicated lanes both, when there is uncongested freeway space upstream of the queue for it to expand, and when there is not. Using these formulas, the authors present qualitative principles that can be used to plan city-wide systems of both, high occupancy vehicle lanes on freeways and dedicated bus lanes on surface streets.


  • English

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Filing Info

  • Accession Number: 01050311
  • Record Type: Publication
  • Source Agency: UC Berkeley Transportation Library
  • Report/Paper Numbers: UCB-ITS-VWP-2007-1
  • Files: BTRIS, TRIS, ATRI
  • Created Date: May 2 2007 7:49PM