Originally Posted by Matt Freeman

The "radar enforced" signs are used in California to prevent people from claiming the officer utilized a speed trap to pull them over (which is against CA code.)

Here's a related issue... there's a CA law that states that a speed limit must be within 5mph of what 85% of the cars are cruzing at. If the limit is much lower than that speed, any speeding tickets issued by police utilizing radar can be be thrown out. (link)

As for the thought that everyone who speeds deserves the ticket... I came to that same conclusion. Just took a mild slap upside the head from my buddy to get there.