Old Lady Driving

An old lady was driving on Interstate 22.
A police car pulled her over and explained to her that she was going at 22 mph.
She said, ''I know, isn't that the speed limit?
The officer said, ''No, this is Interstate 22''.
The police officer looked in the back seat and there were three children looking quite ill.
He asked her if they need help and she explained, ''No, we just left interstate 119."