A type of multi-use path running adjacent and parallel to a roadway, like an extra wide sidewalk.  Sidepaths have special design challenges, as motor vehicles may not expect bikes to be entering an intersection from outside the travel lanes.  AASHTO discourages two-way paths located immediately adjacent to roadways due to the operational and safety issues that can occur.  Sidepaths should not be considered a substitute for street improvements even when the path is located adjacent to a highway, as many bicyclists find these paths less convenient than on-street facilities, particularly for utilitarian trips.