Section 21652 Of Article 1. Driving On Right Side From California Vehicle Code >> Division 11. >> Chapter 3. >> Article 1.

. When any service road has been constructed on or along any public highway and the main thoroughfare of the highway has been separated from the service road, it is unlawful for any person to drive any vehicle into the main thoroughfare from the service road or from the main thoroughfare into the service road except through an opening in the dividing curb, section, separation, or line.