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- W632161796 abstract "IN A STUDY CARRIED OUT BY THE OECD, A VEHICLE IS REGARDED AS BEING WHEN IT IS TRAVELLING LESS THAN 5 SECONDS BEHIND THE PRECEDING VEHICLE AND THE DIFFERENCE IN SPEED IS LESS THAN 10 KM/H. TO OBTAIN A DEFINITION OF BUNCHING, THE STATE HIGHWAYS DEPARTMENT CARRIED OUT MEASUREMENTS OF THE SPEEDS AND TIME INTERVALS OF ALL VEHICLES ON A TEST CROSS-SECTION OF THE COLOGNE-AACHEN MOTORWAY, USING AUTOMATIC DEVICES. AT THE SAME TIME FIVE OBSERVERS WATCHED TO SEE WHETHER A VEHICLE PASSING THE TEST POINT WAS OR NOT. THE TRAFFIC FLOW ON THE INNER LANE WAS 615 VEHICLES PER HOUR (INCLUDING 35% HEAVY GOODS VEHICLES), AND IN THE OVERTAKING LANE 512 VEHICLES (2% HGV'S). THE AVERAGE SPEED IN THE INNER LANE WAS 95 KM/H, AND IN THE OVERTAKING LANE 114 KM/H. OBSERVATIONS SHOWED THAT ON AVERAGE 14% OF THE VEHICLES ON THE INNER LANE AND 33.7% OF THOSE IN THE OVERTAKING LANE WERE BUNCHED. THE LIMITING VALUE OF THE TIME INTERVAL AT WHICH VEHICLES BEGAN TO BUNCH WAS RATHER LESS THAN 3 SECONDS AND NOT, AS FREQUENTLY SUPPOSED, AROUND 5 SECONDS. FOR THOSE VEHICLES FALLING INTO THE BUNCHED CATEGORY, APPROXIMATELY AS MANY POSITIVE AS NEGATIVE DIFFERENCES IN SPEED WERE RECORDED, IN A RANGE VARYING UP TO APPROXIMATELY 50 KM/H. A CHANGE OF SPEED OF 5 KM/H CANNOT BE APPLIED AS A LIMITING CRITERION FOR BUNCHING." @default.
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- W632161796 date "1976-02-01" @default.
- W632161796 modified "2023-09-24" @default.
- W632161796 title "AN INTRODUCTION TO THE DEFINITION OF VEHICLE BUNCHING" @default.
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