Speed Limit

Two pensioners are driving on a highway. Their wives are sitting on the back seats. They drive with no more than 35 miles per hour.

A policeman stops the car and says: "Why are you driving so slowly?"

Grandpa: "We are driving only 35 because this is highway 35!"

Policeman: "The number of the highway stands in no relationship with the speed limit. But... Why do the two women on the back seats look so frightened? Is everything all right with them?"

Grandpa: "They just look like this because we are coming from highway 160!"