Like a tree

A young brunette named Sandra, crawls out of her wrecked car.
The Idaho Falls local cop named Todd asks her what happened.
Sandra began, "It was the strangest thing! I looked up and saw a tree, so I swerved my car to the right. Then I saw another tree, so I swerved to left. Then there was another tree, and another ..."
The cop Todd thought for a minute and then said to the brunette, "I don't know
how to tell you this, but the only thing just like a tree on this road for fifty miles is the air freshener of your car."