Tributes poured in on Saturday for Riley O'Neil , a Chicago city employee who led its bike parking program for years after he was struck and killed while biking in Bridgeport. Witnesses told NBC Chicago that O'Neil was riding in a bike lane when the driver of a car opened a door in front of him, causing him to lose control before he was struck by a semi-truck driver who was traveling behind him before the initial collision. A mangled bike could be seen in the roadway in the aftermath of the crash. Though there is a bike lane on the stretch of Halsted where the crash occurred, it is designated only by a white painted line and is not concrete protected. Police cited the driver of the vehicle that opened the door in front of O'Neil for "unsafe opening" of a car door, parking in a prohibited area, driving on a suspended license and operating an uninsured vehicle. #BikerSafety #chicago #bridgeport