Contractor's research project was to develop and apply the Integrated Transportation/Emissions Model (ITEM) to the Inland Empire. ITEM is a macroscopic wide-area model developed for freeway and arterial road networks, along with microscopic sub-models that can simulate traffic on freeways, freeway on-ramps, arterial intersections and rural highways. This project refines the operation of ITEM by obtaining and using vehicle mix data, accurately calibrating road grade information, modeling the cold-start effect, improving the vehicle load function, collection of a sizable amount of modal emissions data to incorporate into ITEM. The program also performs a detailed emissions study of the Inland Empire, comparing light-duty vehicle emissions output produced by ITEM and the California Air Resources Board (CARB) EMFAC model.
434759.00
The ITEM program is adaptable to all roadway sites. The areas of benefit are unlimited.
This study developed the capability of monitoring emission reductions in varying circumstances. The application of this model can aid local agencies in traffic management and congestion abatement, leading to improved air quality. Through the use of this model, millions of tons of emissions can be reduced through better transportation control measures, better vehicle emission control systems, better land-use planning, and better roadway infrastructure.
Testing details and statistics, study information, and collection methods.