i've done it twice in the same situation;
quake was chasing me and i was on the anulpha overpass, didn't want to risk a respawn so i dropped down onto the track and the quake missed me completely.
i was well chuffed
i'm a curius person so i have another question: what's the fast way to turn 180 from a standstill? would we helpful for races (i end up facing the wrong way a lot)