California Department of Transportation

California Truck Data Collection Project

Overview & Purpose

The California Truck Data Collection (aka Enhanced Loop Detector Cards) project exploits the use of inductive signature technologies, using advanced loop detectors to collect truck data.  New and advanced loop detector cards will be placed in the roadside traffic equipment controller cabinets where Weigh-In-Motion (WIM) stations and Vehicle Detection Sites (VDS) are located along State Highways.  This study will result in accurate measurements of truck types and volumes at high accuracies.  The advanced loop detector cards will provide detailed truck body classes such as intermodal shipping containers, refrigerated vans, and etc.  Caltrans has about 108 WIM stations and 8,000 VDS sites where this technology can be used.  The final product will be a one-year continuous (24 hours-365 days) count database, providing truck data volumes by tractor- trailer types and classifications for 76 locations along California SHWY system. This new dataset will support the Department’s efforts toward validating and updating the California Statewide Freight Forecasting Model (CSFFM) and its integration with California Statewide Travel Demand Model (CSTDM).
Once this project completes successfully (resulting in data with high accuracies), a new process should be proposed for deployment of single loop detectors vs the traditional double loop detectors that could result in significant savings in construction and maintenance cost for the Department and travel time delays for our customers (general public).

Research Team

Institute of Transportation Studies, University of California Irvine.

For more information on the project please contact the project manager:
Vahid Nowshiravan – vahid.nowshiravan@dot.ca.gov (916) 654-5089