Road signals Traffic signs

are one of the primary i n t e r f a c e s between the roadway and the drivers and are used to communicate to drivers i n f o r m a t i o n that would otherwise be unobvious. They are there to remind drivers of traffic rules. They can also advice on special dangers and on the way to avoid them. In the modern traffic system driving without signs would be practically impossible or would happen at the cost of countless accidents. This is the reason why coherent, clear and conspicuous traffic signs are an integral part of a traffic system. To be effective, signs must be designed, built and displayed in such a way that the messages they convey are clear, unambiguous, visible and legible. The lack of traffic signals ’ conspicuity is often cited as a contributing factor by drivers who are involved in accidents at intersections. Increasing the conspicuity of traffic signals will therefore lead to improved safety performance. A better conspicuity of the signs, text and symbols can lead to earlier legibility by the driver resulting in a shorter reaction time. This is particularly important during the night hours, for older drivers (they need more brightness in orde