Vehicle Occupancy Data Collection Methods (phase II)

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Lehman Center for Transportation Research, Florida International University, 2007 - Automatic data collection systems - 155 pages
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Vehicle occupancy data are increasingly being used to assess and monitor congestion management strategies. The traditional methods used to collect these data include the roadside windshield method and the carousel method. The cost of applying these methods and the accuracy of the results depend mainly on the sampling procedure applied. As a test case, the study applies the sampling procedures identified in the Phase I study to collect vehicle occupancy data in Miami-Dade County over a one-year period. Statistical methods were applied to analyze the data collected, and the results are reported. An alternative to the traditional methods of collecting vehicle occupancy data is to make use of the vehicle occupancy information in traffic accident records to estimate AVOs. The method is cost effective and may provide better spatial and temporal coverage than the transition methods. However, the method is subject to potential biases resulting from under- and over-involvement of certain population sectors in traffic accidents. The study examined such potential biases and developed adjustment factors as appropriate. An information system developed in the Phase I study to Estimate AVOs from the Florida accident database for the state roadway system was updated to include adjustments for the potential biases, as well as to enforce the minimum required sample size. A reasonableness check of the results from the system shows AVO estimates that are highly consistent with expectations. In addition, comparisons of AVOs from accident data with the field estimates show that the two data sources produce relatively consistent results.

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Contents

FIELD DATA COLLECTION DESIGN AND DEPLOYMENT
4
FIELD OCCUPANCY DATA ANALYSIS
16
UPDATED POCKET PC FIELD DATA COLLECTION SYSTEM
31

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