Traffic signs provide drivers with adequate and timely information. There are also special cases where additional data on the state of the traffic flow and the weather conditions on the road are required eg. redirecting the traffic flow due to the strong wind at Maslenica or speed limit due to fog or ice on the part of the road passing through Lika. Such situations, which are not permanent in nature, but occur occasionally, can be controlled with the help of variable traffic signs. The goal of introducing variable traffic signs on the roads of high serviceability is increased traffic safety. The construction of modern highways also introduces basic guidelines for the use of variable traffic signs. Describes the types and levels of impacts on traffic, defined traffic and weather criteria for the application of variable traffic signs. Regulations and laws also specify the appearance and dimension of a sign, when the temporary traffic signals are placed along with the permanent traffic signs, how traffic signs need to be maintained, at which level sign is installed, on which side of the road sign is installed and the distance from the roadway.