All the roads anywhere in the Lake Mead National Recreation Area. Basically any road around the lake.
They are paroled by Park Rangers (some of whom are volunteers in uniform). They will ticket for the slightest infraction. On the road skirting the Nevada side of Lake Mead, (Lakeshore Road) the speed limit fluctuates seemingly at random from 40MPH to 45MPH and the will be waiting for you. I’ve even seen them waiting on the launch ramp roads waiting for speeders there!.
The scenery is beautiful, but watch your speedometer too. The government doesn’t need any more of your money.