There was a time in the 1970s, before it became a Peace Camp, when Greenham Common was used as a circuit for car sprints. It was a very fast course.
We used the East end of the airfield starting on the southern taxiway heading West to a rightangle right-hander into a cross-taxiway - both were so wide the corner was on at 100 m.p.h. in a fast car, then another 100 m.p.h. rightangle turn onto the runway heading East followed by the 80 m.p.h. hairpin bend back onto the slightly swerving taxiway back to the start. Those speeds were for Maurice Gates in his TVR Tuscan - I and my friends in our Daimler SP250s were a bit slower, but I still saw over 120 m.p.h. on the main runway.