[kennyguitar]

See your point, but then your getting into the situation where marshalls are at risk pushing a car towards the race track, or obviously the drivers at risk if you have to bring a crane onto the track.

I suppose you could saftey car while the cars are pushed back on but then if it rains and cars are going off every couple of laps it would be too difficult.

Tricky one.

It's not the least bit tricky. It's worked exactly like that just fine in North America for over 50 years. local yellows for course workers and off course cars, full course caution if ther are safety vehicles on track, but in reality, what tracks still have gravel traps in F1 any longer?