<p>Presently in work zones, standard barricade warning lights are used to provide channelizing and warning functions. These yellow flashing lights are presently used without consideration of the specific work zone activities underway at any given time. Several novel concepts for a barricade lighting system (BLS) were developed and evaluated: flashing red lights for use when traffic is stopped or very slow within a work zone, flashing green lights when a work zone is inactive and traffic should proceed normally, expanding yellow lights when drivers should slow down and exercise enhanced caution, and sweeping yellow lights when lane closures require drivers to move to the right or left.</p>