Car driver!

Hi
There was this car that was driving very slowly down the highway. A State Trooper pulls it over. "What have I done wrong, officer?" the driver asks.
"You are going 26mph on a major highway. There is a law against that," the officer says to the driver. "You must go at least 50mph."
"But when I turned on the highway, the sign said 26!" the driver replies.
"HA HA HA!" The officer laughs out loud. "That is because this is Interstate 26! The 26 isn't the speed limit!"
The driver leans back in her car seat and the cop sees another woman sitting beside her. She looked as pale as a ghost.
"What happened to her?" the officer asks.
"I don't know, but she has been that way ever since we got off of interstate 160."