Gov. Code, § 66455

(a) The Department of Transportation may file with the legislative body of any local agency having jurisdiction, a map or an amended map of any territory within one mile on either or both sides of any state highway routing if the department believes the subdivision would have an effect upon an existing or a future state highway in that territory, the route of which has been adopted by the California Transportation Commission. The local agency having jurisdiction shall issue a receipt for the territorial map.

(b) Within five days of a tentative map application being determined to be complete pursuant to Section 65943 for a proposed subdivision located, in whole or in part, within the territory outlined on the territorial map, the local agency shall transmit one copy of the proposed tentative map to the district office of the department in which the proposed subdivision is located.

(c) Within 15 days after receiving a copy of the proposed subdivision map, the department may make recommendations to the local agency regarding the effect of the proposed subdivision upon the highway or highway route. The local agency shall consider these recommendations before acting on the tentative map.