HIGHWAY GUARDRAIL DETERMINATION OF NEED AND GEOMETRIC REQUIREMENTS WITH PARTICULAR REFERENCE TO BEAM-TYPE GUARDRAIL

MANY FACETS OF HIGHWAY GUARDRAILS WERE STUDIED' /1/ TO FORMULATE MEANS FOR DETERMINING THE NEED FOR GUARDRAILS, /2/ TO DEVELOP CRITERIA FOR ESTABLISHING GEOMETRIC FEATURES FOR GUARDRAIL INSTALLATIONS, INCLUDING TRAFFIC OPERATIONAL CHARACTERISTICS, SAFETY FACTORS, AND AESTHETIC CONSIDERATIONS, AND /3/ TO POINT OUT SPECIFIC AREAS FOR FURTHER RESEARCH. ALTHOUGH A GENERAL DESIGN GUIDE FOR ALL TYPES OF GUARDRAILS WAS DESIRED, THE SIGNIFICANTLY DIFFERENT REQUIREMENTS OF EACH TYPE OF GUARDRAILS NECESSITATED AN INVESTIGATION OF INDIVIDUAL BARRIER TYPES. THE UNIVERSAL W-SECTION FORMED SHEET METAL /BEAM TYPE GUARDRAIL/ WAS USED IN THIS INITIAL STUDY. GENERAL WARRANTS FOR GUARDRAIL PLACEMENT WERE DETERMINED FOR EMBANKMENTS, MEDIANS AND ROADSIDE OBSTACLES. CRITICAL HEIGHT OF EMBANKMENT AND STEEPNESS OF FILL SLOPE WERE THE CRITICAL FACTORS IN ASSESSING EMBANKMENT NEED FOR GUARDRAILS. DIMENSIONED LOCATIONS, UNIFORM CLEARANCE TO ROADSIDE OBSTACLES, END ANCHORAGE, APPROACH-END TREATMENT, MINIMUM LENGTH OF INSTALLATION, AND TREATMENT OF STRUCTURES WERE ANALYZED TO DETERMINE GEOMETRIC REQUIREMENTS FOR GUARDRAILS FLUSH WITH THE ROAD SHOULDER. GENERAL NEED AND GEOMETRIC REQUIREMENTS FOR GUARDRAILS IN MEDIANS WERE INVESTIGATED WITH SPECIAL EMPHASIS ON CENTER TREATMENT AT OVERPASSES AND UNDER PASSES. FINALLY, LIGHTING STANDARDS, AND SIGN SUPPORTS WERE STUDIED TO DETERMINE THE PROTECTION REQUIREMENT OF THESE HIGHWAY APPURTENANCES.

  • Record URL:
  • Supplemental Notes:
    • PP1-41, 20 FIG, 17REF, 1APP 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
  • Publication Date: 1964

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00203107
  • Record Type: Publication
  • Files: TRIS, TRB, ATRI
  • Created Date: Jul 14 1994 12:00AM