On the high, big curve, south bound approach to 101, south bound from North Access Road at the San Bruno border(Just before the SF Airport exits). The CHP sets up and parks at the apex of this very high curve and watches the traffic on South Bound 101. Take caution when in this area. I’ve seen them waiting in the afternoon and especially around 11:00PM on Fridays and weekends. If you don’t, you’ll get pulled over at the Millbrae slow down exit. Actually, the area between Brisbane and Millbrae is a hot spot. The CHP turn around at south Millbrae and come back over the freeway to head north, back to Brisbane.