PROCEDURE EMPLOYED IN ANALYSIS OF PASSING DISTANCES

A COMPREHENSIVE ANALYSIS OF PASSING PRACTICES WAS BUILT AROUND THE FOLLOWING SPECIFICATION AS AN ABSOLUTE MINIMUM: (1) CONDUCT IN FIELD INVESTIGATIONS, (2) INCLUDE ONLY THE NORMAL TRAFFIC, (3) OBSERVE ALL UNITS OF THE TRAFFIC STREAM AND RECORD THEIR PROGRESS CONTINUOUSLY, (4) USE HIGHWAY SECTION OF SUFFICIENT LENGTH TO PERMIT THE COMPLETION OF ANY NORMAL PASSING MANEUVER; (5) DISTRIBUTE WORK GEOGRAPHICALLY TO INCLUDE ALL DIFFERENCES IN DRIVING HABITS. THE DEVELOPMENT OF A METHOD SATISFYING THESE REQUIREMENTS WAS DESCRIBED. SAMPLE DATA FOR TWO SINGLE VEHICLE PASSINGS ARE GIVEN. IN EACH SIMPLE PASSING THERE WERE FOUR MAJOR VARIABLES, THREE OF THEM (SPEED OF PASSED VEHICLE, SPEED OF PASSING VEHICLE, AND SPEED OF APPROACHING VEHICLE, IF ANY) BEING INDEPENDENT VARIABLES, WHILE THE FOURTH, THE DEPENDENT VARIABLE, IS THE DISTANCE REQUIRED FOR COMPLETION OF THE MANEUVER. A CORRELATION BETWEEN THE TIME REQUIRED TO PASS AND THE TIME SPACES NORMALLY AVAILABLE IN THE OPPOSING TRAFFIC LANE WILL YIELD ALMOST POSITIVE INFORMATION WITH RESPECT TO HIGHWAY CAPACITY. IT IS NECESSARY TO EXAMINE CLOSELY HOW PASSINGS ARE ACCOMPLISHED AND IN WHAT NUMBER THEY MAY BE EXPECTED, WHETHER THERE IS A PREPONDERANCE OF SINGLE PASSINGS, OR WHETHER THE MAJORITY OF PASSINGS ARE ACCOMPLISHED BY GROUPS OF VEHICLES PASSING OTHER GROUPS, AND WHETHER THE ALINEMENT OF THE HIGHWAY ITSELF PERHAPS HAS A GREATER INFLUENCE ON THE PASSING PRACTICES THAN DO THE PSYCHOLOGY AND DESIRES OF THE INDIVIDUAL DRIVERS FOUND IN NORMAL HIGHWAY TRAFFIC.

  • Supplemental Notes:
    • Vol 18, Pt 1, PP 368-370, 1 TAB
  • Authors:
    • Holmes, E H
  • Publication Date: 1939

Media Info

  • Monograph Title: Proceedings of the Eighteenth Annual Meeting of the Highway Research Board Held at Washington, D.C. November 28-December 2, 1938. Part I
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00228011
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Jun 1 1971 12:00AM