Left-hand traffic in Vienna, Austria, c. Road signs are an essential part of driving and play a vital role in ensuring the safety of drivers, passengers, and pedestrians. That is, according to the rules of left-hand traffic. In most cases, however, the decision to segregate was based on the nature of the road.Traffic was banned for four days during the weekend. During this time, the police moved the road signsand corrected the markings where it was. Trafficrules - United Nations! Enjoy our picture book and quiz. Easy, fun and great for visual leaning. Road Safety Signs Activity. It may be used as a basic trafficguide.2. This is a test about trafficrules.3. The test includes the modal "must/mustn't", directions andtrafficsignsand signboards. Traffic Control When at or approaching traffic signals or signs, yield to pedestrians, bicyclists, and other nearby vehicles that may have the right-of-way. See Right of Way Rules: Who Goes First, in this section. Traffic Signals Solid Red Light A red traffic signal light means STOP.