State Planning. A TCR for I-580 in District 10 was approved in June 2014. Within San ▇▇▇▇▇▇▇ County, the existing facility is a four-lane freeway. The concept facility is an eight- lane freeway with HOV lanes. The proposed interchange improvements are compatible with the TCR and do not preclude I-580 to be widened from a four-lane freeway to ultimate planned eight-lane freeway in the future. The Governments (SJCOG) 2018 Regional Transportation Plan (RTP). The plan identification number is SJ14-2002. According to 2017 Countywide Comprehensive Transportation Plans, Contra Costa Transportation Authority and Caltrans are working on the Innovate 680 Study, which includes a package of multi-modal strategies for improving car and bus operations along the I-680 corridor from the Benicia-▇▇▇▇▇▇▇▇ Bridge to I-580 west of the City of ▇▇▇▇▇ in San ▇▇▇▇▇▇▇ County. The interchange improvements proposed by this project are not captured within the 2017 Countywide Comprehensive Transportation; however both projects have the same intent of improving regional traffic circulation.
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Sources: Project Baseline Agreement, Project Baseline Agreement