EFFECT OF ROADWAY WIDTH ON TRAFFIC OPERATIONS-TWO-LANE CONCRETE ROADS

EXTENSIVE SPEED-PLACEMENT STUDIES WERE CONDUCTED IMMEDIATELY PRIOR TO WORLD WAR II. CONCLUSIONS INCLUDE THE FOLLOWING. SHOULDERS WIDER THAN 4 FT DO NOT EFFECT PAVEMENT WIDTH FOR MOVING TRAFFIC. GRASS AND GRAVEL SHOULDERS HAVE THE SAME EFFECT ON TRANSVERSE POSITIONS OF MOVING VEHICLES. WITH 18 AND 20 FT PAVEMENTS, BITUMINOUS SHOULDERS INCREASE THE EFFECTIVE WIDTH ABOUT 2 FT. LIP CURBS ON 20 FT SURFACES REDUCES EFFECTIVE WIDTH ABOUT 1 FT IN THE DAYTIME. PAVEMENTS LESS THAN 22 FT WIDE ARE HAZARDOUS EVEN FOR MODERATE VOLUMES OF MIXED TRAFFIC; DRIVERS DO NOT REDUCE SPEEDS WHEN MEETING ON NARROW PAVEMENTS. A 24 FT PAVEMENT IS REQUIRED TO PROVIDE DESIRED CLEARANCES FOR COMMERCIAL TRAFFIC. /AUTHOR/

• Record URL:
  https://onlinepubs.trb.org/Onlinepubs/hrbproceedings/24/24-030.pdf
• Supplemental Notes:
  • Vol 24, pp 292-317, 18 FIG, 15 TAB. 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:
  • Taragin, A
• Publication Date: 1945

Media Info

• Media Type: Digital/other
• Monograph Title: Proceedings of the Twenty-Fourth Annual Meeting of the Highway Research Board (Unassembled)
• Serial:
  • Highway Research Board Proceedings
  • Volume: 24
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Concrete pavements; Location; Motion; Motor vehicles; Pavements; Road shoulders; Speed; Two lane highways; Width
• Uncontrolled Terms: Moving vehicles
• Old TRIS Terms: Pavement width; Placement
• Subject Areas: Design; Highways; Operations and Traffic Management; Pavements;

Filing Info

• Accession Number: 00203557
• Record Type: Publication
• Files: TRIS, TRB
• Created Date: Sep 13 1971 12:00AM