DETERMINATION OF WINDSHIELD LEVELS REQUISITE FOR DRIVING VISIBILITY

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. /AUTHOR/

• Record URL:
  • http://onlinepubs.trb.org/Onlinepubs/hrbbulletin/56/56-001.pdf
• Supplemental Notes:
  • No 56, pp 1-16, 7 FIG, 4 TAB, 5 REF Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved
• Authors:
  • Heath, Warren M
  • Fitch, Dan M
• Publication Date: 1952

Media Info

• Monograph Title: Night visibility
• Serial:
  • Highway Research Board Bulletin
  • Issue Number: 56
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Automobile drivers; Driving; Glazing; Motor vehicles; Traffic safety; Traffic signals; Visibility; Windshields
• Subject Areas: Highways; Safety and Human Factors;

Filing Info

• Accession Number: 00222867
• Record Type: Publication
• Files: TRIS, TRB
• Created Date: Apr 28 1994 12:00AM