I-680 Corridor System Management Plan (Contra Costa, CA)

The project  involved the use of Contra Costa Transportation Authority (CCTA) travel model to provide demand input data to TOPL and to evaluate the impacts of various projects on arterial diversion and freeway performance. The study corridor is the stretch of I-680 corridor between I-580 in the south and the Solano county line in the north. The challenge of the project is how to model the currently deployed HOT facilities and some upcoming HOT facilities that will be converted from HOV lane in future scenarios since there is no toll demand estimation and analysis module in the model. The approach taken is to treat HOT lane as a parallel facility of GP lanes, which is open to all vehicle classes but with a little bit cost that needs to be fine-tuned for reasonableness. The cost on HOT lane is determined when the HOT lane reaches but does not exceed its maximum capacity, which is 1600 vehicles per hour per lane. In other words, it is assumed that the HOT lane will be operated under the ideal condition. Then, the flow difference on the HOV/HOT lane before and after the conversion can be further post-processed to obtain the toll flows based on different toll policy.


Prime contractor: System Metrics Group (SMG)

Project Sponsor: Caltrans

Project period: Feb 2013 - Mar 2014