In 2005, Caltrans partnered with the Metropolitan Transportation Commission (MTC) and the California PATH program at UC Berkeley to create the nation’s first public Connected Vehicle Test Bed on El Camino Real (State Route 82), a signalized arterial roadway that serves more than 50,000 vehicles traveling each day between San Francisco and San Jose.

In 2018, Caltrans and PATH worked with USDOT to update the equipment in the Test Bed so that it now complies with the latest connected vehicle standards and implementation architecture. These improvements were recently used to successfully demonstrate Multi-Modal Intelligent Traffic Signal System (MMITSS), including CV-based traffic signal control and signal priority for transit, freight, and pedestrians, and Environmentally-Friendly Driving, two important suites of connected vehicle applications that were developed using USDOT funding.

Started January 2019, Caltrans is working with PATH to expand its size from the original 11 intersections to 31 intersections between Medical Foundation Dr in Palo Alto and Grant Rd in Mountain View. As of Novenber 2019, the Test Bed has 16 operational intersections between Medical Foundation Dr and Dinah's Ct in Palo Alto. It is expected that this connected vehicle corridor will serve as a model deployment that can be duplicated on similar corridors in other urban regions of California.

Caltrans is working with PATH and ProspectSV to ensure that the Test Bed is available to all developers to test how connected vehicle technologies perform under real-world conditions.