## Tuesday, December 16, 2008

### Four Way Stop

Four cars come to a four way stop, all coming from a different direction. They can't decide who got there first, so they all go forward at the same time. They do not crash into each other, but all four cars go. How is this possible?

1. If A is opposite to B, and C opposite to D, A and B turn to the right (in countries with right-hand traffic) or to the left (in countries with left-hand traffic), and C and D either go straight on or turn also to the right (or to the left respectively).

2. I think you figured out all the possibilities, Johanna. I would have just talked about everyone going right (or left) and left it at that.

3. each car turns right

4. All cars could drie straight if the East and West facing cars move very slowly while the North and South cars get through the intersection quickly (or vice-versa).

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