US-20 (Broadway) about 1 mile west of I-15
The speed limit drops to 35 from 45 as you ascend a hill coming into town. The police like to sit in the parking lot of an auto-repair facility facing traffic such that they are hard to see. (once in a while, they actually park so you can see the logo on the door, but not often.) The nature of the surroundings does not change enough to give a clue, and the speed limit changes suddenly – you have to be looking for the signs to see them, and you better step on the brake at the top of the rise if you have "powered" up the hill.