Not needing any additional aggravation on their backside, riders are warned of upcoming rumble strips on the road during Iowa’s RAGBRAI bicycling event on July 20, 2014. The Registers Annual Great Bike Ride Across Iowa is a weeklong bicycling touring event that attracts riders from around the world to ride across the Hawkeye state each July. U.S Air Guard Photo by Master Sgt. Vincent De Groot/ released