I haven't lived in CA for 8 years, but they definitely used radar guns. I heard that the way they patrolled speed from aircraft is that from the air, they know the amount of time it should take for a car to go between two points. Based on how much time it took the car, they can calculate their speed. Not sure if that's how it works or not, but that's how I understood it.
I would say that the cops in CA were far more strict/stringent on traffic violations than here. I wish cops were stricter here. My mom got a $300 ticket for crossing a solid white line at an intersection. Have you ever heard of someone getting a ticket in Utah for crossing a solid white line? I never have. Where I lived, the drivers may not have been more skilled than Utah drivers, but they obeyed ALL of the driving laws. I didn't have to worry about some idiot crossing a double solid white to get in front of me in the carpool lane. People were more alert there as well. There are far more important things for cops to do than monitor traffic, but I would LOVE to see people get tickets for the following:
- crossing solid white lines
- turning left on a red (i.e., entering the intersection after the light turns red). I see 3-5 cars "squeeze" by after it turns red
- not coming to a full and complete stop on a red light right turn. This drives me crazy. People think it's a "yield" sign
- not coming to a full and complete stop at a stop sign. Once again, it's not a "yield" or a "slow down" sign. I almost got hit today because I stoppoed, the other guy was slowing, so I went. Well, he never intended to stop until he saw that I was already 5 feet into the intersection
- not yielding properly on the freeway. For some reason, some poeople here think that the proper way to merge is to hug the white shoulder line and you'll magically merge with the other lane. They forget that the merging lane does not have the right-of-way.
S0rry for the rant, I just had to get that off my chest. I imagine there are far more accidents and injuries from people running red lights, stop signs, and crossing solid lines than going 8-10 mph over the speed limit. I also wish the semis had to stay in the right 2 lanes.