LEGIBILITY OF URBAN HIGHWAY TRAFFIC SIGNS USING NEW RETROREFLECTIVE MATERIALS
نویسندگان
چکیده
منابع مشابه
Optimizing the Legibility of Symbol Highway Signs
Introduction Symbol (i.e., "pictorial") highway signs yield legibility distances which are on average twice as great as those achieved for their text sign counterparts. However, the relative superiority of symbol signs is neither uniform nor universal. Some symbol signs are legible from 3-times as far away while other poorly designed symbol signs can be recognized at only half the distance of t...
متن کاملUsing the "Blur Tolerance" Technique to Predict and Optimize the Legibility Distance of Symbol Highway Signs
This study investigates the hypothesis that variations in symbol sign legibility distance can be accounted for on the basis of a sign's dependence upon high spatial frequency contours to convey critical information. Using digital image processing techniques, highway signs were blurred to remove all high spatial frequency information. A blur recognition threshold was established for each experim...
متن کاملNighttime Legibility of Traffic Signs: Conditions Eliminating the Effects of Driver Age and Disability Glare
Al~traet--The effects of observer age and environmental glare on nighttime legibility of traffic signs were investigated in two field experiments with the subjects driving or riding in a car towards a sign. Experiment ! showed that equating older and younger subjects in terms of their low luminance/high contrast visual acuity resulted in elimination of any age effects on legibility. Furthermore...
متن کاملDRAFT MANUSCRIPT Title: Legibility of Text on Traffic Signs as a Function of Luminance and Size
This study investigates on a quantitative basis two strategies that can be used to increase the legibility distance of retroreflective traffic signs with negative luminance contrast legend or symbols at night. The first strategy involves the increase of the letter, numeral, or symbol size associated with a corresponding increase in the stroke width (representing the visual detail) and with an i...
متن کاملEffects of Driving Speed and Sign Reflectance on Nighttime Highway Sign Legibility Distance and Reading Time Requirements
Nighttime highway sign legibility distance was evaluated as drivers maintained speeds of 5 versus 60 MPH. Effective legibility distance fell by approximately 30% when driving at high speed (114.9 versus 81.2 m at 5 and 60 MPH, respectively; F(1,9) = 48.6, p < 0.001). This finding suggests that past research, usually conducted under static viewing conditions (i.e., less than 5 MPH), probably ove...
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ژورنال
عنوان ژورنال: TRANSPORT
سال: 2010
ISSN: 1648-4142,1648-3480
DOI: 10.3846/transport.2010.28