Here's an improved version of my old drivable vehicle. It uses the torque option for the phys_thrusters so the wheels actually spin and move the vehicle instead of faking it by applying linear force to them. That had the unfortunate consequence of allowing you to achieve flight should you drive forward while facing the sky. Although that might work for a spaceship or something else alien-related. Also this video has an inaccuracy, you cannot control the tank in spectator mode, I just changed the logic around for this video so I could use the spectator camera. EDIT: Turns out the "Orient locally" spawnflag for the phys_torque doesn't work and the phys_thruster doesn't spin the wheels properly (instead making the entire car bob around). Unfortunately I've exhausted all the the entities that stimulate physics objects.