STUDIES OF SPECIAL SYMPTOMS WHEN DRIVING IN SPEED LIMITS

UNTERSUCHUNGEN UEBER BESONDERE SYMPTOME BEIM FAHREN UNTER GESCHWINDIGKEITSBEGRENZUNGEN

THE AIM OF THE INVESTIGATIONS IS TO ESTABLISH WHETHER DRIVING FOR LONG PERIODS (APPROX. 7 HOURS) ON MOTORWAYS SUBJECT TO A SPEED LIMIT OF 130 KM/H LEADS TO GREATER PSYCHIC EXHAUSTION, MONOTONY OR IMPAIRMENT OF VIGILANCE THAN SIMILAR JOURNEYS WHERE THERE ARE RECOMMENDED SPEEDS AND IF THIS IS APPARENT FROM PARTICULAR ASPECTS OF DRIVING BEHAVIOUR. USING A VEHICLE WITH SUITABLE INSTRUMENTATION, 40 PERSONS TOOK PART DURING 1975 AND 1976 IN TEST DRIVES ON TWO SECTIONS OF MOTORWAY TO PROVIDE BEFORE/AFTER AND WITH/WITHOUT COMPARISONS CONCERNING THE EFFECTS OF SPEED LIMITS. BY MEANS OF VIDEO EQUIPMENT AND RECORDERS THE FOLLOWING INFORMATION WAS COLLECTED AND LATER EVALUATED: (1) CRITICAL INCIDENTS OR POTENTIAL SOURCES OF DANGER SUCH AS REDUCTION IN MINIMUM FOLLOWING DISTANCE, MISTAKES WHEN CHANGING LANES, ETC. (2) BREACH OF REGULATIONS SUCH AS EXCEEDING THE SPEED LIMIT, OVERTAKING ON THE RIGHT, ETC. (3) DRIVING CHARACTERISTICS AND ADDITIONAL ALERTNESS INDICATORS SUCH AS OVERLOOKING OPTICAL SIGNALS, STEERING CORRECTIONS ON STRAIGHT TRACKS, COMMUNICATION BETWEEN DRIVER AND PASSENGER, SUBJECTIVE FEELINGS OF EXHAUSTION, ETC. TECHNICAL COMPARISON OF SUCH DATA AS JOURNEY TIME AND FUEL CONSUMPTION UNDER THE EXPERIMENTAL CONDITIONS IS ALSO OF INTEREST.