Cal. Vehicle Code § 21800

(a) The driver of a vehicle approaching an intersection shall yield the right-of-way to any vehicle which has entered the intersection from a different highway. (b) (1) When two vehicles enter an intersection from different highways at the same time, the driver of the vehicle on the left shall yield the right-of-way to the vehicle on his or her immediate right, except that the driver of any vehicle on a terminating highway shall yield the right-of-way to any vehicle on the intersecting continuing highway. (2) For the purposes of this section, “terminating highway” means a highway which intersects, but does not continue beyond the intersection, with another highway which does continue beyond the intersection. (c) When two vehicles enter an intersection from different highways at the same time and the intersection is controlled from all directions by stop signs, the driver of the vehicle on the left shall yield the right-of-way to the vehicle on his or her immediate right. (d) (1) The driver of any vehicle approaching an intersection which has official traffic control signals that are inoperative shall stop at the intersection, and may proceed with caution when it is safe to do so. (2) When two vehicles enter an intersection from different highways at the same time, and the official traffic control signals for the intersection are inoperative, the driver of the vehicle on the left shall yield the right-of-way to the vehicle on his or her immediate right, except that the driver of any vehicle on a terminating highway shall yield the right-of-way to any vehicle on the intersecting continuing highway. (e) This section does not apply to any of the following: (1) Any intersection controlled by an official traffic control signal or yield right-of-way sign. (2) Any intersection controlled by stop signs from less than all directions. (3) When vehicles are approaching each other from opposite directions and the driver of one of the vehicles intends to make, or is making, a left turn.