California Code, Government Code - GOV § 67920

(a) The Nevada County Transportation Planning Agency is hereby created, as a local area planning agency, and not as a part of the executive branch of the state government, to provide regional transportation planning for the area of Nevada County.  The agency may be known by any other name it chooses and is the legal successor to the Nevada County Transportation Commission for all purposes.

(b) The governing body shall be composed of four members appointed by the county board of supervisors, and one member appointed by the city council of each incorporated city in the county.

(c) The appointing authority, for each regular member it appoints, may appoint an alternate member to serve in place of the regular member when the regular member is absent or disqualified from participating in a meeting of the agency.