When jumping across edges on unpowered vehicles (like a skateboard), I don't think you should get dirty if you land successfully. It makes sense for doing it by foot, because you roll when you land an inevitably pick up whatever grime is on the ground. But if you land a jump on a board, the only thing touching the ground is your wheels.
…Also, the room description doesn't print after you land the jump. Not a massive issue, but thought it was worth mentioning.
STREET SAM