Р-53

С РАЗГОНА (-у) PrepP these forms only adv

while in full motion, having gained speed: (of a means of transportation) (while) barreling along

(while going (moving etc)) at full (high) speed (while going) full tilt (of a person or animal) at a dead run.

Машина с разгона врезалась в сарай. The car slammed into the shed at high speed.