Citation

Heath WM, Fitch DM. Highw. Res. Board bull. 1952; 56: 1-16.

Copyright

(Copyright © 1952, National Research Council (U.S.A.), Highway Research Board)

DOI

unavailable

PMID

unavailable

Abstract

The 1950 revised American Standard Code for Safety Glazing Materials for Motor Vehicles establishes requirements for glazing materials installed within levels requisite for driving visibility. A study to determine the extent of glazed areas necessary for driving visibility is reported. Data on current passenger cars ar given showing the areas available for seeing by all but the tallest 2-1/2 percent and all but the shortest 2-1/2 percent of california licensed drivers. Visibility angles required for observance of traffic signals are also given. From the above data and information on human dimensions, a method is suggested for determining the levels requisite for driving visibility applicable to any automobile for various percentages of drivers. The dimensions and technique for checking windshields to establish a level that will include 85 percent of the drivers are given. This percentage was tentatively agreed upon as a practical value by the engineering committee of the American Association of Motor Vehicle Administrators in June, 1951.