Consider a vehicle x at an intersection. If x has a green light when its turn to move arises...

...then it may jump directly to tile 1, tile 2, or tile 3 (if the jumped-to tile is vacant).

In the situation above, x may ask the environment whether tile 1, tile 2, and tile 3 are vacant.

[Tiles 1, 2, and 3 are the ``initial `heading away from the intersection' tiles of the other three segments that touch the intersection.'']