Rezo can't drive for reasons that will probably be obvious even apart from the fact his world doesn't have this kind of technology. He is not going to try to drive, and if he can't find somebody to drive a vehicle for him he will not mind hitching a ride on the Jingyi Express.

(And honestly a dragon is probably more comfortable to him than these Weird Zoomy Metal(?) Deathtraps you people call "speeders.")