thats what i dont get with F1, they make most of their tracks tarmac over the gravel traps but say a car came steaming down the hangar straight at Silverstone and its brakes failed, what would you rather have, a gravel trap to take away some of that speed and then hit the tyres or no gravel trap and just tarmac so theres no chance of slowing the car down and hitting the tyres at full whack.