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Open Access Publications from the University of California

Scholarly Works (2 results)

  • Article
Research Reports (2006)
This research demonstrated two potential VII (vehicle-infrastructure integration) services, one in traffic data probes and the other with safety. A real private vehicle, operating on California roadways, “talked” to the roadside, with the roadside backhaul interfacing into an existing California Department of Transportation (Caltrans) database and archival application. Demonstration of a probe application showed great promise for supplementing Caltrans’ database with VII- or DSRC-based probe data. Similar promise was shown with a road condition monitoring system, which demonstrated the capability of detecting slippery and rough surfaces in real time.
    Cover page: Expediting Vehicle Infrastructure Integration (EVII): where the rubber meets (and talks to) the road
    • Article
    Earlier Faculty Research (2008)

    The paper describes a methodology and its application to measure total, recurrent, and non-recurrent (incident related) delay on urban freeways. The methodology uses data from loop detectors and calculates the average and the probability distribution of delays. Application of the methodology to two real-life freeway corridors—one in Los Angeles and the other in the Bay Area—indicates that reliable measurement of congestion should also provide measures of uncertainty in congestion. In the two applications, incident-related delay is found to be between 13 to 30 percent of the total congestion delay during peak periods. The methodology also quantifies the congestion impacts on travel time and travel time variability.

      Cover page: Measuring Recurrent and Non-Recurrent Traffic Congestion
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