Vehicle Occupancy Data Collection Methods (phase II)
Lehman Center for Transportation Research, Florida International University, 2007 - Automatic data collection systems - 155 pages
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.
What people are saying - Write a review
We haven't found any reviews in the usual places.
FIELD DATA COLLECTION DESIGN AND DEPLOYMENT
FIELD OCCUPANCY DATA ANALYSIS
UPDATED POCKET PC FIELD DATA COLLECTION SYSTEM
6 other sections not shown
2nd Ave accident data accident records accident severity accident vehicle adjustment factors allows the user Ave and SW AVO estimates AVO Model AVO Trend AVO Variations AVOs for different Bird Rd Biscayne Bd census tract Click cumulative VMT Daylight Hours differences in AVOs District driver's age EX NW EX SW facility types field data collection Figure Flagler Street Florida TP NW Freeways highest AVO Index Survey Roadway InfoUSA Intersecting Roadways Date Julia Tuttle Kruskal-Wallis test large urban counties location AVOs Louis St Miami-Dade County number of occupants Number of persons number of vehicles occupancy rates Off-Peak Period P-values P.M. Peak Period persons per vehicle Pocket PC population potential biases predictors R2 value Roadway Intersecting Roadways screen selected St and Bird St and SW St SW statistical stopped vehicles Surface Streets Survey Roadway Intersecting SW 28th St SW 37th Ave Table Toll Facilities variables vehicle occupancy data vehicles involved weekday AVO