With generally any large vehicle like the Cyber Tank, Super Drill, Mountain Annihilator, Or even the tanks, your car will occasionally run into the ground and force you to lose all of your speed. One of my friends told me that it happens to any car, but I haven’t been able to see it nearly as often as small cars.
The bug happens at any speed, at least 4 times every minute, all you need to do is drive forward.
Video of the glitch
Rukifennec