Abstract
The purpose of this paper is to explore the factors that determine conspicuity of regulatory signs, and to investigate how to install regulatory signs to increase the chances of attracting attention. Factors under consideration were types of signs, lateral clearance, location, roadside or overhead signs, the number of plates attached to one post and the road environment. The main results are as follows. The recognition rate for elderly drivers was similar to that of younger drivers. Overhead signs have higher recognition rates than conventional roadside signs. Signs were less conspicuous in arterial roads than in residential roads. The outcome of the quantification method shows that the most effective action to enhance recognition rates is to use overhead signs.
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