US Patent 7268701 Portable traffic signalling device

A portable traffic signalling device comprises a frame on wheels which supports an enclosed occupant compartment arranged to receive an occupant therein. The compartment is pivotal on the frame between an upright deployed position and a transport position lower in elevation than the deployed position. A traffic indicator is supported on the frame for directing vehicular traffic as controlled by the occupant of the compartment. The device permits a human operator to judge how to direct traffic within a safe environment. The use of a portable compartment with traffic indicators is safer than use of conventional flagpersons to temporarily direct traffic as the occupant of the device is less likely to be subject to fatigue and the like.