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原文传递 Legibility Comparison of Three Freeway Guide Sign Alphabets; Final research rept. Sep 95-Aug 97

题名：	Legibility Comparison of Three Freeway Guide Sign Alphabets; Final research rept. Sep 95-Aug 97
作者：	Hawkins, H. G.; Wooldridge, M. D.; Kelly, A. B.; Picha, D. L.; Greene, F. K.
关键词：	Freeways; Traffic signs; Highway maintenance; Traffic control devices; Alphabets; Older drivers
摘要：	Modern fully retroreflective sign legends can create a blooming effect that reduces legibility. This research project evaluated three alphabets to determine if performance of a white high intensity legend on a green high intensity background could be improved by reducing the blooming effect. The three alphabets were: Series E(Modified), Clearview (trademark), and British Transport Medium. Overhead and ground-mounted sign positions were evaluated in both daytime and nighttime conditions. There was no sign illumination for the nighttime conditions other than vehicle headlights. Both legibility (unknown word) and recognition (known word) distances were measured. A total of 54 subjects participated in both daytime and nighttime trials. There was significant variability in the results of the various experimental conditions. In general, the results indicated that Clearview (trademark) was slightly more legible than Series E(Modified) in the overhead position in both daytime and nighttime conditions. The extent of improvement was generally in the range of two to eight percent over Series E(Modified). The greatest improvement was achieved for older drivers. Clearview (trademark) ground-mounted signs were less legible than Series E(Modified) in daytime conditions.
总页数：	124p
报告类型：	科技报告