The 2017 Isle of Man TT races kick off tomorrow June 4 with the TT Superbike race and finishes on Friday June 9 with the Senior TT race. If you don't know what the Isle of Man TT is, watch the following video from the 2014 race with Guy Martin leaving the pits just behind Michael Dunlop: Note: 2017 marks the 110th anniversary of the Isle of Man Tourist Trophy races. This makes it the world's longest running motorsports event. The TT is currently run on the Snaefell Mountain Course, which has been used since 1911. (From 1907 to 1910, a shorter and flatter 15.84 mile course was used since motorcycles of that era did not have enough power to climb the road leading up Snaefell Mountain.) The Snaefell Mountain Course is 37.73 miles per lap and has approximately 265 corners. The elevation changes from just over sea level to 1384 feet at the mountain's summit. As you can see from the video, this race is run on public roads. There are cobblestone curbs, concrete sidewalks, stone walls, stone buildings, steel lamp posts, trees, hedges, etc. lining the sides of the course. Top speeds are very close to 200 m.p.h. and the average speed is just over 130 m.p.h. per lap.