Three types of inter-letter spacing, three letter weights, and two letter heights of negative contrast Clearview fonts (mixed-Ĭase) were compared with three Standard Highway Alphabets fonts (mixed and alluppercase). Experiment 1 determined the legibility distances of the Clearview Typeface System and the Standard Highway Alphabet during daytime and nighttime conditions. For this dissertation, two experiments were conducted – a field test (Experiment 1) and a laboratory experiment (Experiment 2).
Glance legibility measures a driver’s ability to read a sign in a brief period of visual exposure. Legibility distance is defined as the maximum distance at which a driver is able to correctly read the sign. The objective of this study was to evaluate the performance of traffic sign typeface systems in regard to their legibility distances and glance legibility.
To provide a solid basis for these assertions on the manual and other references, it is necessary to develop effective evaluation methods to support the transportation regulations and policies. The Manual on Uniform Traffic Control Devices for Streets and Highways (MUTCD) describes the desired sign designĬharacteristics for sign use on highways including long visibility distances, large lettering and symbols and short legends for quick comprehension. To determine the effectiveness of signs, many factors can be taken into consideration. Therefore, the design, placement, operational effects, maintenance requirements, and uniformity of traffic signs should be considered carefully to maximize the effectiveness of these signs to fulfill drivers’ needs for traffic information in different driving environments.
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EVALUATING THE CLEARVIEW TYPEFACE SYSTEM AND HIGHWAY STANDARD ALPHABETS SERIES FOR POSITIVE AND NEGATIVE CONTRAST SIGNS ABSTRACTĪs an important communication tool on roadway systems, traffic signs are commonly used by drivers to navigate to their destinations, avoid potential risks, and be aware of traffic laws and regulations.
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