United States Department of Transportation
i
High occupancy vehicle (HOV) lane management system : amendment A.
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2011-12-01
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[PDF-2.20 MB]
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Abstract:This report describes a system designed to provide Single Occupancy Hybrid Vehicles (SOHVs) restriction
messages dynamically to drivers through variable message signs. This system will allow California to
comply with federal requirements (that Single Occupancy Hybrid Vehicles (SOHVs) must be excluded
from High Occupancy Vehicle (HOV) lanes if their speed performance is degraded) by providing a way for
Caltrans Traffic Management Centers (TMCs) to determine whether or not SOHVs should be permitted in
HOV facilities. In turn, they could disseminate that information through control of variable message signs
that indicate to drivers which vehicles are permitted in the HOV lane.
The work performed under this project represents a step forward to understanding various HOV restriction
scenarios and their impact on HOV lane and mainline congestion. In this project, researchers studied, via
simulations, the effects of permitting or restricting eligible single occupant hybrid vehicles (SOHV) from use of
HOV facilities. The team simulated various control scenarios on a selected corridor (25 mile segment of
California Interstate-210 Eastbound). Results from the simulations showed that reduction in vehicles eligible to
use HOV lane (not just SOHV but any vehicle) could reduce not only the delay experienced by HOV vehicles
but also the total system delay.
This high-level system design was presented in sufficient detail to allow implementation as software or a
relational database. Implementation would allow for the simulation of traffic scenarios to be tested against
real data. This should be the next step in the development of this system.
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