Highway Signs

A police officer pulled over a car. When he walked up to the car, he saw that there were three nuns in the car.

He said, "Ma'am, you're driving too slow, could you please drive faster?"

The nun replied, "Oh, I'm sorry officer. I saw a 21 on the sign and assumed the speed limit was 21 miles per hour."

The officer explained, "No, ma'am. The speed limit is 65. The highway is 21."

Then the police officer looked in the back and noticed that the other two nuns were in a tight embrace and shaking like leaves.

"Excuse me, Sister," said the officer to the driver, "but what's wrong with those two?"

"Oh," replied the driver. "That must be because we just got off Highway 145."