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Analysis of Estimating Saturation Flow under Heterogeneous Traffic Condition as Against Conventional Techniques


Ammu Gopalakrishnan , School of Planning and Architecture, New Delhi; Dr. Sewa Ram, School of Planning and Architecture, New Delhi; Dr. P. K. Sarkar, School of Planning and Architecture, New Delhi


Saturation flow rate, signalized intersection, cycle time, root mean square


Saturation flow is the most important parameter used to determine the capacity of a signalized intersection which directly influence in determining the phase time of the traffic signal. Most of the existing and popular methods available to determine saturation flow rate are established under homogeneous traffic condition where cars are the predominant users and lane discipline is strictly followed. Queue length should be known to the last vehicle to calculate the saturation flow using the traditional average saturation headway method. But it is difficult to measure the queue length during peak hours when long queue is formed. In heterogeneous traffic condition the base saturation flow considered in HCM 2010 cannot be an ideal one, since it depends on the vehicle flow rate, cycle timing, driver perspective, approach volume etc. IRC:SP:41-1994 also have explained a relationship between saturation flow and capacity. By the use of these conventional methods under Indian condition, the saturation flow rate is either over estimated or under estimated due to the heterogeneity of traffic. This study aims at determining saturation flow as per ground scenario under heterogeneous traffic condition considering a four arm fixed time signalized intersection using Root Mean Square (RMS) method. It also aims to compare the study method with equations explained in HCM 2010 and IRC:SP:41-1994.

Other Details

Paper ID: IJSRDV4I90471
Published in: Volume : 4, Issue : 9
Publication Date: 01/12/2016
Page(s): 706-710

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