A police officer had just pulled over a car full of elderly ladies for going too slow on a major highway.
Police officer: "Why were you driving so slowly?"
Elderly driver: "I kept seeing all these signs with the number 20 on them and figured that was the speed limit."
Police officer: "No, Ma´am, that is the highway number."
Driver: "Oh, I´m so sorry, Officer, I didn´t know that."
Then the police officer looks into the back seat and sees that the ladies there have panic-stricken faces and white knuckles from holding on to each other too tightly.
Police officer: "What´s wrong with the ladies in the back seat?"
Elderly Driver: "Oh, we just got off Highway 166 a few miles ago."