MEDIAN STUDY 1952

A DETERMINATION WAS MADE OF THE TYPE OF MEDIAN DIVIDER WHICH WOULD PROVIDE THE GREATEST SAFETY. THE FINDINGS PERTAINED ONLY TO FOUR-LANE HIGHWAYS. MEDIAN DIVIDERS WERE CLASSIFIED IN THE GENERAL CATEGORIES AS (1) TRAVERSABLE TYPE, (2) DETERRING TYPE, AND (3) NON-TRAVERSABLE TYPE. NO ONE TYPE OF MEDIAN PROVED BEST IN ALL CASES; SELECTION NEEDS TO BE MADE FOR THE PARTICULAR ROAD, PRESENT AND ANTICIPATED TRAFFIC VOLUME BEING AN IMPORTANT FACTOR FOR CONSIDERATION. THE TYPE OF MEDIAN HAD A SUBSTANTIAL INFLUENCE ON THE TOTAL NUMBER OF ACCIDENTS AND THE NUMBER OF INJURY ACCIDENTS ON A DIVIDED HIGHWAY. TRAVERSABLE PAVED AND TRAVERSABLE AND DETERRING EARTH MEDIANS HAD LOWEST TOTAL ACCIDENT AND GENERALLY LOWEST INJURY ACCIDENT RATES. BELOW 20,000 VEHICLES PER DAY, THE UNDIVIDED HIGHWAY ACCIDENT RATE COMPETED CLOSELY WITH THE DIVIDED TYPES. ADVANTAGES OF THE NON-TRAVERSABLE MEDIAN IN FEWER APPROACH TYPE ACCIDENTS WERE MORE THAN OFFSET BY THE HIGHER RATE OF SINGLE VEHICLE ACCIDENTS. LIMITED OBSERVATIONS OF HIGHWAYS IN SEMI-URBAN AREAS, EXCLUDING INTERSECTIONS, INDICATED THAT (1) NARROW DETERRING MEDIANS AND THE RAISED BAR MEDIAN, PARTICULARLY, APPEARED MOST FAVORABLE FROM THE ACCIDENT STANDPOINT, AND (2) THE ACCIDENT RATE ON THE UNDIVIDED HIGHWAY WAS VERY CLOSE TO THE MOST FAVORABLE OF DIVIDED TYPES AT ALL TRAFFIC VOLUMES.

  • Supplemental Notes:
    • 35 Pp, 6 FiG, 9 TAB, 12 PHOT, 1 APP
  • Corporate Authors:

    California Division of Highways

    Bridge Department
    Sacramento, CA  USA  05914
  • Authors:
    • Telford, E T
    • ISRAEL, R J
  • Publication Date: 1952

Subject/Index Terms

Filing Info

  • Accession Number: 00203271
  • Record Type: Publication
  • Files: TRIS
  • Created Date: May 3 1971 12:00AM