Is It This Bad Elsewhere? How Do People Drive Where You Live?

Section 40802(b):
defines where "radar or other electronic devices" can be used to determine speed -- in essence, either on "local streets and roads" or on highways where a traffic survey has been conducted within the last five years. I find that California police are very familiar with this law, and with the local traffic surveys. I contested a radar ticket several years ago, and found that I was on a stretch that had recently been surveyed. If I had been two miles further I would have beaten the ticket.

California law. The police can't enforce the posted speed limit by radar if the "usual traffic speed by monitoring is higher than the posted speed limit". Pretty much make speed limit signs a waste of aluminum and paint.