So while the camera manipulation strategy helps, I think roadblocks' spawning may either A: not be entirely tied to your camera, or B: spawn more likely based off of when a cop last saw you. Or both.

The roadblock spawns are possibly buggy - I saw a roadblock pop in ahead of me once with the aerial relative cam.

52.9 seconds is possible, I got it in a run at one point but the cops saw me at the last second with their stupid roadblock. This scenario is worse than G2G RNG.