California Code, Government Code - GOV § 14528.7

A city or county acting jointly with the transportation planning agency having jurisdiction over the city or county may adopt a resolution requesting the rescission of a state highway route location within the city or county, as the case may be.  The city or county, acting jointly with the transportation planning agency, may submit an alternative state highway project proposal with the resolution.  If the commission concurs in the resolution, the route location shall be rescinded, and the department shall proceed with the sale of excess real properties that were acquired for the rescinded route location.

In the case of a city or county under the jurisdiction of a county transportation commission, only the county transportation commission may adopt the resolution and submit an alternative state highway project proposal.