The Idaho State Police have reported the second fatal motorcycle accident in August. This is also the 8th fatal motorcycle accident Idaho State Police have reported since the 100 Deadliest Days of Summer began. The most recent fatal motorcycle accident happened in Bonneville County on August 6th at 5:39 PM. ISP Report Fatal Pickup vs Motorcycle Crash South of Idaho FallsThe ISP report says the accident involved a motorcycle and a pickup truck on S Yellowstone Highway at S 15th W, on the south end of Idaho Falls. S Yellowstone Highway at 15th Street crosses in front of the Rocky Mountain Supply business access and parking lot.