Only on bikes mate - cash. If anyone knows Cadnam junction on M27 near Southampton. Used to do 5 laps of the small dual cariageway with roundabouts at either end under the M27 when I was at University in mid 90's. Funnily enough I wrote my 250 off there.... If the old bill turned up - just scattered back into New Forest.....

Wouldn't do it in a car though - you're not anonymous, and it's a lot harder to out run the cops!!!