VEH §21655.1: (a) A person shall not operate a motor vehicle on a portion of a highway that has been designated as a transit-only traffic lane except in compliance with the directions of a peace officer or official

(a) A person shall not operate a motor vehicle on a portion of a highway that has been designated as a transit-only traffic lane except in compliance with the directions of a peace officer or official traffic control device. (b) This section does not apply to a driver who is required to enter a lane designated as a transit-only traffic lane in order to make a right turn or a left turn in a location where there is no left-turn lane for motorists, or who is entering into or exiting from a highway, unless there are signs prohibiting turns across the lane or the lane is delineated by a physical separation, including, but not limited to, a curb, fence, landscaping, or other barrier. (c) (1) The agency with jurisdiction over the highway or a public transit agency shall place and maintain, or cause to be placed and maintained, signs and other official traffic control devices, as necessary, indicating that a portion of a highway has been designated as a transit-only traffic lane for the exclusive use of public transit buses and other vehicles designated by a local authority or the Department of Transportation and to advise motorists of the hours of operation of the lane as a transit-only traffic lane. (2) A public transit agency placing and maintaining signs and other official traffic control devices pursuant to paragraph (1) shall do so with the agreement of the agency with jurisdiction over the highway. (d) For purposes of this section, “transit-only traffic lane” shall have the same meaning as that term is defined in Section 40240.