A system of computer-controlled variable message signs (matrix signs), which was implemented on many sections of the Dutch freeways, is described. The signs can display message like speed limits and 'change lane'. The main conclusions from an evaluation study are that the system reduces the number of accidents considerably, but has less influence on traffic flow. Field trials to determine optimum display features are described. These trials provided relations between the most relevant photometric quantities: horizon luminance, message luminance, pixel intensity and inter-pixel distance. Practical examples of the control of the sign's light output as a function of varying ambient light level are given.
Matrix signs for motorways: systems design and optimum photometric features
Sichtzeichen fuer Kraftfahrzeugstrassen: Systementwurf und optimale photometrische Merkmale
Lighting Research and Technology ; 20 , 2 ; 55-60
1988
6 Seiten, 5 Quellen
Aufsatz (Zeitschrift)
Englisch
IMPACTS OF VARIABLE AND PERMANENT TRAFFIC SIGNS ON MOTORWAYS
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