Descriptive study of vehicle classwise headways using mixed traffic data
By: Saha, Pritam
.
Contributor(s): Roy, Rupali.
Publisher: USA Springer 2022Edition: Vol.103(4), Dec.Description: 1287-1298p.Subject(s): Humanities and Applied SciencesOnline resources: Click here
In:
Journal of the institution of engineers (India): Series ASummary: This paper illustrates an investigation of vehicle classwise headways under mixed traffic. Based on field experiments conducted on Indian highways, the study reveals that traffic composition and lead–lag vehicle combination collectively affect drivers’ behaviour in choosing headways. The field survey indicates that highway through traffic primarily comprised trucks and cars. Accordingly, the study considered four-vehicle pair combinations: ‘truck–truck’, ‘truck–car’, ‘car–car’ and ‘car–truck’. It performed investigations across three different traffic mixes characterized by the 20% heavy vehicles and 15, 10 and 5% three-wheeled vehicles share in composition. Experiments show an increase in the probability of shorter headways when the share of three-wheeled vehicles in traffic upturns resulting in the frequent formation of platoons. An inspection of results indicates that such probability is relatively high for car–car combination, whereas it was least mainly due to size and vehicle dynamics for truck–truck. Often truck drivers’ keep relatively shorter headways and exhibit different driving psychology while following a car. On the other hand, car drivers prefer to keep adequate headway while following a truck except when slower vehicles, including motorized/non-motorized three-wheeled ones in traffic, are insignificant. Passing opportunities increase largely in such a situation, prompting them to move with shorter headways while taking overtaking decisions, even if the lead vehicle is a truck.
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This paper illustrates an investigation of vehicle classwise headways under mixed traffic. Based on field experiments conducted on Indian highways, the study reveals that traffic composition and lead–lag vehicle combination collectively affect drivers’ behaviour in choosing headways. The field survey indicates that highway through traffic primarily comprised trucks and cars. Accordingly, the study considered four-vehicle pair combinations: ‘truck–truck’, ‘truck–car’, ‘car–car’ and ‘car–truck’. It performed investigations across three different traffic mixes characterized by the 20% heavy vehicles and 15, 10 and 5% three-wheeled vehicles share in composition. Experiments show an increase in the probability of shorter headways when the share of three-wheeled vehicles in traffic upturns resulting in the frequent formation of platoons. An inspection of results indicates that such probability is relatively high for car–car combination, whereas it was least mainly due to size and vehicle dynamics for truck–truck. Often truck drivers’ keep relatively shorter headways and exhibit different driving psychology while following a car. On the other hand, car drivers prefer to keep adequate headway while following a truck except when slower vehicles, including motorized/non-motorized three-wheeled ones in traffic, are insignificant. Passing opportunities increase largely in such a situation, prompting them to move with shorter headways while taking overtaking decisions, even if the lead vehicle is a truck.
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