Section 22351 Of Article 1. Generally From California Vehicle Code >> Division 11. >> Chapter 7. >> Article 1.
22351
. (a) The speed of any vehicle upon a highway not in excess of
the limits specified in Section 22352 or established as authorized
in this code is lawful unless clearly proved to be in violation of
the basic speed law.
(b) The speed of any vehicle upon a highway in excess of the prima
facie speed limits in Section 22352 or established as authorized in
this code is prima facie unlawful unless the defendant establishes by
competent evidence that the speed in excess of said limits did not
constitute a violation of the basic speed law at the time, place and
under the conditions then existing.