Various different forms of yellow warning and flashing lights are used to attract the attention of road users when it comes to protecting roadwork sites, giving advance warning of police and fire brigade operations and drawing attention to special hazards in road traffic.
As a basic rule and with the exception of mobile warning trailers at the top and traffic cones for personal protection where flash lights are prescribed, warning lights are used in all other applications. For example, the German Guidelines for Safeguarding Roadwork Sites (RSA) recommend that socalled advance warning lights are positioned in pairs next to the carriageway to give road users ample advance warning of roadwork sites. This advance warning effect is enhanced by synchronising the lamps so that they always light up at exactly the same time.
Temporary traffic control light systems as per RSA Part A 3.2.2 are used to control traffic safely through lane switches. Here several warning lights light up and go off consecutively, guiding the traffic safely through the changed road layout.
Self-synchronising running light systems mounted in some cases on guide cones or collapsible signs – are used almost everywhere where the police and fire brigade are in operation. They provide effective protection thanks to the clear warning effect and quick, easy handling.
Bright LED lamps give active warning before construction sites and hazard situations, giving road users a clearly visible indication of the safe road layout.