From the manual of the game:
You're at the wheel of the red car, cruising along at 20 mph. Step on it and speed down the roadway. Come up on the other cars and bump them off the road. Crash as many of them as you can!
Keep your eyes peeled for bends in the road and be ready to maneuver when the road narrows! Swerve to miss center islands and debris...jump to clear water. Quick reflexes are crucial!
Make it to the end of one roadway and you get bonus points. Then you automatically begin at the next roadway.
Whenever you crash, your next car takes its place on the road. The game ends when all your cars crash. Start a new game and go get 'em!