I myself, along with my mother and lots of other people, like the speed cameras. The drivers are behaving themselves and slowing down!
An unscientific observation: Every couple of weeks, I go out to my mother's house in Sun City West. Driving home, I go north on Loop 101 from Bell Road. The freeway soon bends east and ultimately ties into I-17. There are three fixed speed cameras along this stretch. At I-17, I turn south and usually get off at Bethany Home Road. There is a speed camera for the southbound lanes right under the overpass, and you can see the camera flashes reflect off the bridge out of the corner of your eye when you're waiting for the light to change at the end of the offramp.
When the cameras went up in 2008, as I drove home (observing the speed limits), I was guaranteed to see at least one or two flashes from each of the three cameras on Loop 101 as they flashed speeders going more than 11 mph over the speed limit. In addition, while waiting for the light to change at the Bethany Home offramp, I would see the camera flashes there three or four times as speeding drivers triggered the shutters.
In the last several months, I almost never see the cameras flashing speeding motorists any more. My last trip to Mother's house, I saw one flash reflection at the Bethany Home camera. I can't tell you when was the last time I saw the Loop 101 cameras taking pictures. So obviously, the motorists are slowing down!
I'd love to see speed cameras on Los Angeles area freeways!
Unfortunately, as those of us who want more sanity on our highways are finding out, putting teeth into our traffic laws is more like pulling teeth.