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SUBJECTIVE ASPECTS OF BRAKING

THE MANNER IN WHICH THE DRIVER BRAKES TO REST WAS STUDIED BY OBSERVING SEVERAL DRIVERS UNDER VARIOUS CONDITIONS AND PUTTING A RECORDING DECELEROMETER IN THE CAR. THE BEHAVIOR AMONG DRIVERS WAS QUITE DIFFERENT ALTHOUGH MOST HAD A DECELERATION CURVE (A) WITH A SINGLE MAXIMUM AND (B) BEGINNING AND ENDING AT ZERO. SOME DRIVERS HAD A CURVE WHICH, WHEN NORMALIZED, WAS ALMOST THE SAME FOR ALL CONDITIONS. SOME EFFORTS WERE MADE IN THE ANALYSIS TO CORRELATE THE BEHAVIOR OF THE CURVES WITH HYPOTHESES ABOUT ERROR CORRECTION ON THE PART OF THE DRIVER. THESE WERE NOT FRUITFUL. MEASUREMENTS WERE ALSO MADE TO DETERMINE HOW ACCURATELY DRIVERS COULD ESTIMATE SPEEDS. THESE ESTIMATES WERE FOUND TO BE RATHER ACCURATE, IN APPARENT CONTRAST WITH RESULTS OBTAINED BY THE ROAD RESEARCH LABORATORIES. HOWEVER, THE EXPERIMENTAL CONDITIONS WERE DIFFERENT ENOUGH SO THEY ARE NOT DIRECTLY COMPARABLE. EXPERIMENTS WERE PERFORMED ABOUT COMPARING DISTANCES (RATHER THAN ESTIMATING THEM) AND THE SUBJECTS WERE FOUND TO BE QUITE ACCURATE IN COMPARING DISTANCES. IT WAS HYPOTHESIZED THAT AN UNDERSTANDING OF BRAKING BEHAVIOR WOULD THROW LIGHT ON OTHER ASPECTS OF DRIVING BEHAVIOR. THEREFORE EXPERIMENTS WITH CAR FOLLOWING WERE CARRIED OUT AND SIMILARITIES SUGGESTED THAT THE DRIVER USES ESSENTIALLY THE SAME CRITERIA WHEN BRAKING TO A STOP AND WHEN FOLLOWING A CAR. MEASUREMENTS OF REACTION TIMES, BOTH VISUAL AND MANUAL, WERE MADE. THERE WAS SOME CORRELATION BETWEEN THE TWO AND WITH STOPPING TIME. /BPR/

  • Supplemental Notes:
    • Vol 59, pp 58-61
  • Corporate Authors:

    IPC Transport Press, Limited

    Dorset House, Stamford Street
    London SE1 9LU,   England 
  • Authors:
    • Spurr, R T
  • Publication Date: 1969-2

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Filing Info

  • Accession Number: 00225684
  • Record Type: Publication
  • Source Agency: Traffic Systems Reviews & Abstracts
  • Files: TRIS
  • Created Date: Jun 15 1970 12:00AM