VEHICLE SPRAY PATTERN STUDY

SPRAY PATTERNS FROM PASSING VEHICLES WERE INVESTIGATED TO DETERMINE THE OPTIMUM LATERAL AND VERTICAL PLACEMENT OF MILE POST MARKERS FOR AN INTERSTATE-TYPE HIGHWAY WITH WIDE, PAVED SHOULDERS. QUANTITATIVE DATA ARE PRESENTED FROM HIGHWAY TEST INSTALLATIONS OVER AN 18-MONTH STUDY PERIOD. DAYTIME BRIGHT- NESS RETENTION WAS VERY HIGH, AND NO VEHICLE SPRAY PATTERN OR ACCUMULATION RATE WAS OBTAINABLE FROM THESE DATA. PHOTOGRAPHS SHOW THE CHANGE IN APPEARANCE OF THE SIGNS AFTER THE 18-MONTH TEST PERIOD, BUT DO NOT GIVE A TRUE COMPARISON OF THE RELATIVE BRIGHTNESS OF THE SIGNS. NIGHTTIME BRIGHT- NESS READINGS OF REFLEX REFLECTION PROVED TO BE THE MOST EFFECTIVE INSTRUMENTATION IN DETERMINING THE VEHICLE SPRAY PATTERN. FROM ISO-BRIGHTNESS CURVES SHOWING BANDS OF EQUAL NIGHTTIME BRIGHTNESS RETENTION, THE OPTIMUM SIGN PLACEMENT WAS 14 FT OUT AND 6 FT ABOVE THE EDGE OF THE PAVEMENT. PLACING SIGNS AT THIS LOCATION WOULD HAVE RESULTED IN A NIGHTTIME BRIGHTNESS RETENTION OF OVER 50 PERCENT FOR ALL THE TEST SIGNS IN THIS STUDY.

• Record URL:
  • http://onlinepubs.trb.org/Onlinepubs/hrr/1967/179/179-003.pdf
• Supplemental Notes:
  • Paper sponsored by Committee on Night Visibility and presented at the 46th Annual Meeting. 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:
  • Anderson, Jack W
  • Carlson, Glen C
• Publication Date: 1967

Media Info

• Media Type: Digital/other
• Features: Figures; References;
• Pagination: pp 38-52
• Monograph Title: Night visibility
• Serial:
  • Highway Research Record
  • Issue Number: 179
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Brightness; Crash investigation; Lighting; Location; Photography; Reflection; Refraction; Retaining walls; Studies; Traffic signs; Vehicles
• Identifier Terms: Interstate Highway System
• Old TRIS Terms: Light /illumination/; Placement; Retaining
• Subject Areas: Highways; Operations and Traffic Management; Safety and Human Factors; Vehicles and Equipment;

Filing Info

• Accession Number: 00219872
• Record Type: Publication
• Report/Paper Numbers: HS-000 708
• Files: TRIS, TRB
• Created Date: Sep 5 1994 12:00AM