It makes sense that traffic stops often become the focal point for allegations of racial profiling. The enforcement of some traffic laws can be nebulous and discretionary, and stops tend to be the most frequent contact between the public and police.
Here’s a guide to the law on traffic stops:
When can the cops pull me over?
The cops can pull you over when they believe you’ve done something wrong.
That means they can identify you’ve violated one of the innumerable provisions of the California Vehicle Code. That can run the gamut from speeding, neglecting to use a turn signal, running a red light or driving with a broken taillight.