Diesel Bombers - Flowers

A man in West Virginia had a flat tire, pulled off on the side of the road, and proceeded to put a withered bouquet of flowers in front of the car and another one behind it. Then he got back in the car and waited.
A passerby rubbernecked the scene as he drove by and was so curious he turned around and went back. He asked the fellow what the problem was.
The man replied, "I got me a flat tar."
The passerby asked, "But what's with the flowers?"
The man responded, "When you breaks down they says to put flares in the front and flares in the back! I doesn't understand it neither. But, you stopped, so, I guess it works! You got a extry spar?"