There will be an open room, with a firing line on one side. There is a conveyor to push cars into this room.
At the firing line, there is nine robots armed with rifles that will shoot at any cars in the range. In the control room, there is a viewing area, and controls for the conveyor and the bots. The amount of robots active can be set to 0, 3, 6, or 9 (0 by default).
The firing line is accessible to players. From here, players can grab a rifle (which can’t be taken out of the crusher) and shoot cars themselves.
I was trying to think of a bullet-based crusher that isn’t too similar to The Minigun.