MITCHELL, S.D. (MITCHELLNOW) The annual Sturgis Motorcycle Rally launches Friday in the Black Hills area. The world’s largest biker party is celebrating 85 years. To help deal with the heavy traffic, more stop signs, speed trailers, traffic signals, and message boards are in place. The South Dakota Highway Patrol says troopers will watch out for speeding and unsafe driving. The rally runs through August 10th.