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Oct. 10, 2007
Traffic Jam
Each rectangle in the diagram above represents a car or truck. Each vehicle can move forward and backward only in the direction in which it faces on the grid of squares. Your task is to slide the vehicles back and forth, shifting them along the grid as needed from one open space to another, to clear a path so that the red car (X) can get to the exit (arrow).
Can you do it? If so, how many moves does it take?
You can try solving the puzzle on your computer (using a Java applet).
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Think about which vehicles you need to get out of the way to get the red car to the exit. It takes more than 20 moves to get the red car out.
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Here is the shortest sequence of moves that would free the red car:
C up 1, D up 2, F left 1, X left 2, A down 2, B left 1, E up 2, G up 2, H right 3, O right 3, A down 2, F right 2, X right 2, C down 4, D down 4, F left 2, X left 2, B left 2, A up 4, F right 2, X right 2, C up 2, O left 2, G down 1, X right 4.
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