A police officer pulled over a nun driving a car, and said, 'Ma'am, you're driving much too slowly, could you please drive faster?"

And the nun says, 'Oh, I saw the sign with the "21" and assumed the speed limit was 21 kph"

The officer explains: 'No ma'am, the speed limit is 80. The highway number is Interstate 21."

Then the police officer looks in the back seat and see the other two nuns shaking like leaves.

"Excuse me, Sister, but what's wrong with your two colleagues?"

"Oh, that's probably because we just got off Highway 205."