[Mike Carr]

I agree with SSDiv6. My dad has been a truck driver for forty years, and once had go into one of those runaway truck ramps when the brakes failed. They are made of pea gravel. When he stopped, about halfway up, he was buried up to the axle in gravel. Now, granted, a 80,000 pound semi will probably sink better going 70-80 mph than a 2,000-2,400 pound dragster/funny car at much higher speeds, but might be worth a shot.