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THE ROAD IN RELATION TO TRAFFIC REQUIREMENTS--JAPAN

THE INFLUENCE OF GEOMETRIC DESIGN OF ROADS ON VEHICLE STABILITY AND TRAFFIC ACCIDENTS ARE CONSIDERED. IN SNOWY DISTRICTS, THE GEOMETRIC FEATURES OF ROADS SHOULD INCLUDE A SUFFICIENT WIDTH OF SPACE FOR SNOW REMOVAL OPERATIONS AND THE STEEPEST CROSS SLOPE SHOULD BE LESS THAN 6-8 PERCENT. EMERGENCY STOPPING LANES SHOULD BE PROVIDED ON ROADS WHERE THE WIDTH OF THE SHOULDER IS NOT SUFFICIENTLY WIDE AND BE SUITABLY SPACED AT INTERVALS OF ABOUT 300 M. SURFACE IRREGULARITY SHOULD BE TESTED BY MEANS OF A STRAIGHT EDGE, ROUGHNESS INDICATOR AND PROFILOMETER, RESPECTIVELY. REGARDING THE AREA TRAFFIC CONTROL SYSTEM OF TRAFFIC SIGANLS USED IN THE CENTRAL BUSINESS DISTRICT OF TOKYO, THE SOFTWARE SYSTEM OF JAPAN IS ORIGINAL IN SOME RESPECTS. FOR INSTANCE, IT CONTAINS FOUR CONTROL MODES ACCORDING TO THE CONDITION OF TRAFFIC AND ONE CONTROL MODE IN EACH SUB-AREA IS INDEPENDENTLY SELECTED BASED ON THE VALUES OF STOPPING FREQUENCIES, DELAY, TRAVEL TIME AND TRAFFIC FLOW. CONCERNING THE SHAPE AND SIZE OF CURBS, RECENT EXPERIMENTS SHOWED THAT: (1) BY HOW MUCH A COLLIDING VEHICLE MOUNTS A CURB IS RELATED TO THE HEIGHT OF THE CURB BUT IS ONLY SLIGHTLY RELATED TO THE SHAPE OF THE CURB'S FRONT FACING; AND (2) THE CURB'S CAPACITY FOR RIGHTING COLLIDING VEHICLES IS NOT GREATLY INFLUENCED BY THE SHAPE OF THE FRONT FACE OF THE CURB, BUT IT IS ONLY WHEN COLLISION OCCURS AT LOW SPEEDS AND WHEN THE ANGLE OF IMPACT IS SMALL THAT A CURB CAN BE EXPECTED TO CORRECT THE DIRECTION OF TRAVEL OF A COLLIDING VEHICLE.

  • Supplemental Notes:
    • QUESTION IV ANS-12
  • Authors:
    • Ichihara, K
    • Hanawa, K
    • Yoshioka, T
    • WATANABE, S
  • Publication Date: 1971

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Filing Info

  • Accession Number: 00203881
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Apr 11 1974 12:00AM