Exit 280/Page Mill, and go to Arastradero southbound. There is a hill, with a steep decline. Speed limit is 35mph which is dead on target. However, the cops use a radar and just sit in a driveway just before the curve. If you have a heavy car, you can exceed 35mph (think of SUVs) and get busted. I see cars pulled over very routinely, so the enforcement is high.