Volume List  / Volume 9 (4)



DOI: 10.7708/ijtte.2019.9(4).08

9 / 4 / 431-441 Pages


Burma Vamshi Krishna - Department of Civil Engineering, VNR Vignana Jyothi Institute of Engineering and Technology, Hyderabad, Telangana, India -

Adepu Ramesh - Department of Civil Engineering, VNR Vignana Jyothi Institute of Engineering and Technology, Hyderabad, Telangana, India -

Molugaram Kumar - Department of Civil Engineering, University College of Engineering, Osmania University, Hyderabad, Telangana, India -


Traffic conditions in India are entirely different from other developed countries of the world. The traffic flow is highly dynamic in nature and observed at all mid – block section and interaction of vehicles is also expected to change with the mix characteristics. It is also observed that the interaction among the vehicles is maximum and highly complex during peak period. In this situation the mixed traffic condition situation different types of vehicles share the same roadway space without any physical segregation. The interaction of vehicles under above situation is expressed as the amount of resistance caused to flow of traffic by a vehicle type when compared with standard vehicle (passenger car). Passenger Car Unit (PCU) which is a suitable measure to represent the relative impedance caused by a vehicle under heterogeneous traffic. PCU depends on vehicular speed, vehicle type, and traffic volume. In this article an attempt is made to develop PCU values for heterogeneous traffic conditions on urban roads. PCU values obtained from the study different category of vehicles is compared with the PCU values provided in IRC recommendations. It is concluded that estimated field PCU values vary with speed, land use pattern and vehicles dimensions. Traffic flow curves when plotted with optimum PCU values show close to ideal fundamental curves, this also improves considerably with the change in roadway characteristics. The curves representing fundamental traffic flow relationships among three basic variables, namely speed, density and flow have also been established. Thus a systematic approach has facilitated to understand the heterogeneity in traffic flow parameters has been made through this investigation.

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Arasan, V.T.; Arkatkar, S.S. 2010. Microsimulation study of effect of volume and road width on PCU of vehicles under heterogeneous traffic, Journal of Transportation Engineering 136(12): 1110-1119.


Arasan, V.T.; Koshy, R.Z. 2005. Methodology for Modelling Highly Heterogeneous Traffic Flow, Journal of Transportation Engineering 131(7): 544-551.


Arkatkar, S.; Velmurugan, S.; Puvvala, R.; Ponnu, B.; Narula, S. 2016. Methodology for simulating heterogeneous traffic on expressways in developing countries: a case study in India, Transportation Letters 8(2): 61-76.


Arkatkar, S.S. 2011. Effect of intercity road geometry on capacity under heterogeneous traffic conditions using microscopic simulation technique, International Journal of Earth Sciences and Engineering 4(6): 375-380.


Chandra, S.; Kumar, U. 2003. Effect of lane width on capacity under mixed traffic conditions in India, Journal of transportation engineering 129(2): 155-160.


Chandra, S.; Sikdar, P.K. 2000. Factors affecting PCU in mixed traffic situations on urban roads, Road and transport research 9(3): 40-50.


Khanorkar, A.R.; Ghodmare, S.D. 2014. Development of PCU Value of Vehicle under mix Nature Traffic Condition in Cities on Congested Highways, International Journal of Engineering and Computer Science 3(5): 6109-6113.


Mankar, P.U.; Khode, B.V. 2016. Capacity Estimation of Urban roads under Mixed Traffic Condition, International Research Journal of Engineering and Technology 3(4): 2750-2755.


Praveen, P.S.; Arasan, V.T. 2013. Influence of Traffic Mix on PCU Value of Vehicles under Heterogeneous Traffic Conditions, International Journal for Traffic & Transport Engineering 3(3): 302-330.


Radhakrishnan, P.; Mathew, T.V.; 2011. Passenger car units and saturation flow models for highly heterogeneous traffic at urban signalised intersections, Transportmetrica 7(2): 141-162.


Sharma, N.; Arkatkar, S.S.; Sarkar, A.K. 2011. Study on heterogeneous traffic flow characteristics of a two-lane road, Transport 26(2): 185-196.