STUDY ON HETEROGENEOUS TRAFFIC FLOW CHARACTERISTICS OF A TWO-LANE ROAD / HETEROGENINIO TRANSPORTO EISMO SRAUTO CHARAKTERISTIKOS DVIEJŲ JUOSTŲ KELYJE / ХАРАКТЕРИСТИКИ ГЕТЕРОГЕННОГО ПОТОКА ДВИЖЕНИЯ НА ДВУХПОЛОСНОЙ ДОРОГЕ

Sharma, Nitish; Arkatkar, Shriniwas Shrikant; Sarkar, Ashoke Kumar · 2011 · Crossref

DOI: 10.3846/16484142.2011.593120

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Summary

This study investigates the traffic flow characteristics of heterogeneous vehicle mixes on undivided two-lane roads in India, a context distinct from homogeneous traffic flows in developed nations due to loose lane discipline and diverse vehicle types. The research aims to extract field data to assess arrival patterns, time headway distributions, and speed distributions, ultimately deriving fundamental relationships among speed, density, and flow. The study focuses on a 500-meter stretch of National Highway 11 between Sikar and Jaipur, characterized by a 7.5-meter carriageway and uninterrupted traffic flow. Data collection involved video recording over a two-hour period (4 p.m. to 6 p.m.) using four synchronized cameras to capture vehicle entry and exit times. Traffic composition was dominated by motorized two-wheelers (approximately 36–37%) and cars (34–35%), with hourly volumes ranging from 654 to 733 vehicles. Data extraction utilized FMV6 software to determine precise in-time and out-time values, allowing for the calculation of headways and speeds. Vehicles were categorized into nine types, including buses, trucks, and non-motorized vehicles. The analysis evaluated statistical distributions for arrival and headway data using chi-square tests. Vehicle arrivals at all observation points and combined directions were successfully modeled using the Poisson distribution, as calculated chi-square values were consistently lower than critical values at a 0.05 significance level. Similarly, time headway data, which included instances of zero headways due to overtaking maneuvers, fit the negative exponential distribution. Speed analysis revealed significant variability across vehicle categories. Cars exhibited the highest mean speeds (approximately 67–70 km/h) and the largest standard deviations, indicating wide speed ranges. In contrast, slower vehicles like tractors and bicycles had mean speeds below 25 km/h with lower deviations. Motorized two-wheelers showed mean speeds around 47–50 km/h. The study confirms that heterogeneous traffic on two-lane roads follows specific statistical patterns for arrivals and headways, while speed distributions vary significantly by vehicle type, providing a foundational understanding for modeling such traffic flows.

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• traffic density