That reminds me of an incident on the A30 at Drum bridges roundabout along a straight road in my twentys. It was a favourite place for ton up bikers to meet and show off, one guy on a Triton got it wrong and went straight through a cheap panel fence that had been erected to make it more obvious that there was a roundabout just beyond the crest of a rise. He went through the fence at about 80 MPH and luckily only suffered cuts and bruises, he was more concerned about his bike than the blood dripping from his face.