Click or press space.
Full title: Driving on a dirt road with other buses in RoR cuz why not? Btw for anyone wondering how I helped those buses that got stuck, I just clicked and held onto their hoods and gently dragged them forward. For the bus I was driving though, I just used repair mode so I won't have to worry about getting stuck or damaged (I avoided that part since I knew what would probably happen if I tried to go over that bump, so basically I just flew over it).
