88 mph (142 km/h) was chosen as the time travel speed because it was easy to remember and looked “cool” on the speedometer.[30] A custom speedometer was built to simulate 88 mph, as a 1979 law passed by then-President Jimmy Carter had limited speedometers to 85 mph to reduce speeding.
No. https://en.m.wikipedia.org/wiki/DeLorean_time_machine#:~:text=88 mph (142%20km%2Fh,85%20mph%20to%20reduce%20speeding.