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Article

ASSESSMENT OF LEVEL-OF-SERVICE ON URBAN ARTERIALS: A CASE STUDY IN KOLKATA METROPOLIS

DOI: 10.7708/ijtte.2016.6(3).06


6 / 3 / 303-312 Pages

Author(s)

Subhadip Biswas - Civil Engineering Department, Indian Institute of Technology Roorkee, Roorkee-247667, Uttarakhand, India -

Bhupendra Singh - Civil Engineering Department, Indian Institute of Technology Roorkee, Roorkee-247667, Uttarakhand, India -

Arpita Saha - Civil Engineering Department, Indian Institute of Technology Roorkee, Roorkee-247667, Uttarakhand, India -


Abstract

Mixed traffic conditions in emerging countries like India make it difficult to adopt Level of Service (LOS) criteria given in Highway Capacity Manual (HCM) of developed nations. Present study aims at identifying alternative performance measure which will exhibit better compatibility to define LOS in context of urban mixed traffic. A total sixteen hours of traffic volume and speed data have been recorded by videography at selected road segment of a six lane divided urban arterial in Kolkata metropolis. Percentage Speed Reduction (PSR) from Free Flow Speed (FFS) has been identified as an alternative performance measure for LOS assessment as it is a good representative of overall mobility state and also found sensitive to prevailing traffic flow conditions on the road. FFS of individual vehicle category has been computed from the normal distribution curves fitted upon the speed data under free flowing condition. Kolmogorov-Smirnov (K-S) test which has been performed to check goodness-of-fit of these modelled curves, has shown satisfactory compatibility with the observed data. K-mean clustering has been adopted to classify the observed PSR data into sub groups and consequently Silhouette method has been used to validate these clusters. Finally, six LOS classes bounded by threshold values of PSR have been proposed.


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