Increase your speed to 204MPH, press F10 to pause the game, then press fire. The game slows down to a crawl, but you can still steer the car. So, by continually pressing fire and moving left and right, you can safely pass road obstructions!

The routes to take for each stage are listed below:

Stage 1: Take road 15 on your right, then road 70 on your left, and keep going.
Stage 2: Take road 191 to your right, then road 666 on the left, and then road 160 on your left and keep going.
Stage 3: Take road 285 on the right and road 60 to your left, and keep going.
Stage 4: Take road 70 on your right, road 54 on your left, road 25 on your right, road 10 to the left, and, finally road 180 on your right, and keep going.