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ABSTRACT
Since the prohibitive traffic signs provide information by negatively presented concept, the effect of prohibitive traffic signs design on users' subjective preference and visual performance deserves to be discussed further. A preference-rating test was held in stage I to investigate the effects of sign-type (ten types) and slash-type (a slash over the symbol, a slash under the symbol, a partial slash, and a translucent slash) on the subjects' subjective preference. Analysis of results showed that slash-type was a significant factor for the subjects' preference. The under slash was significantly preferred compared to the over slash, and the over slash was significant preferred compared to translucent slash and partial slash. A driving simulating experiment was developed in stage II to evaluate the effects of sign-type, slash-type, and driving velocity (40 and 60 km/hr) on the subjects' visual performance. Analysis of results showed that the three factors were all the significant factors for the subjects' visual performance. Subjects performed better visual performance when the pictorials of traffic signs were simple, clear and when its slash did not cover the major pictorial features of signs. Subjects visual performance for under slash and translucent slash was significantly better compared to the over slash, but it was worse than partial slash. When the driving velocity was 40 km/hr, subjects performed better visual performance. Suggestions are proposed to assist designers in revising prohibitive traffic signs.