Legibility of road marking symbols in the roadway (original) (raw)

The regulations concerning road markings have recently opened up more for use of symbols in the roadway. However, regulations for the dimension of road marking symbols vary even between the Nordic countries, and research on how the symbols should be designed is lacking. The aim of the ViP project described in this report was to establish guidelines for how symbols in the roadway should be extended along the road. In order to achieve the goal, a simulator study on legibility distances was carried out, followed by two minor field studies. In the simulator study, four two-character symbols and four three-character symbols were used; 55, 56, 65, 66, 55N, 56N, 65S, 66S. For each of four symbol sizes; 1.6 m, 2.5 m, 4.0 m and 7.5 m and each of four speeds; 30, 50, 70 and 90 km/h, one two-character symbol and one three-character symbol were presented to the driver. The simulator study resulted in a main effect of symbol size; the larger the symbol size, the larger the legibility distance. A...