That is insane and awesome. I thought watching the Isle of Man TT was crazy, but they don't all head out at the same time. Can't believe how they are jockeying for position on those roads at 180+ mph. I've been on some of those roads and they are narrow!
Check this one out. Its about the poor mans TT the Manx GP. They are changing the format next year to Hold a ClassicTT races followed by the ManxGP for modern machines and amateur riders. Its like the TT but more chilled and the Island is full of Classic bikes as the Vintage Motorcycle Club holds a big rally and vintage Trials there during the same period. They filmed last years event here's the trailer