Driving Backwards Uphill

On a narrow mountain's road a man saw a police car driving uphill backwards.

- Hi guys. Why are you driving backwards?

- Because we are not sure that we will find the place to make u-turn on the top of the mountain.

After one hour the same man saw the same police car driving downhill backwards again.

- But guys, why are you driving backwards again?

- We have found the place to make u-turn up there.