California Code, Streets and Highways Code - SHC § 75.9

Upon the selection, adoption, and determination of the location for a state highway or freeway, the commission shall notify all planning agencies and legislative bodies having responsibility pursuant to Section 65300 of the Government Code for the adoption of the general plan or plans in the area affected by such commission action. Within 90 days after receipt of such notice, all such planning agencies and legislative bodies shall revise the circulation element of their general plans to reflect such commission action.