Editing Racetrack (game) (section)

===Collisions and crashes===

[[File:Escape.png|thumb|A crash. The player here is unable to avoid leaving the track on their next turn, whichever of the nine squares they choose to move to.]]
Usually, cars are required to stay on the track for the entire length of the move, not just the start and end. On heavily convoluted racetracks, allowing the line segment representing a move to cross the boundary twice (with start and end points inside the track), some unreasonable shortcuts may be allowed.

Several cars may be allowed to occupy the same point simultaneously. However, the most common and entertaining rule is that while the line segments are allowed to intersect, a car cannot move to or through a grid point that is occupied by another car, as they would collide.

If a player is unable to move according to these rules, the player has crashed. A crashed car may leave the game, or various systems for penalizing crashes can be devised.

A player running off the track may be allowed to continue, but is required to brake and turn around, and re-enter the track again crossing the boundary at a point ''behind'' the point where it left. At high speeds, this will take a considerable number of moves.

Another possibility is to penalize a car with "damage points" for each crash. E.g., if it runs off the track or collides, it receives 1 damage point for each square of the last movement, and comes to an immediate stand-still. A car with 5 damage points, say, cannot run anymore.