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Title: An Approach to Deal with Heterogeneity on Roundabouts
Authors: Ahmad A.
Rastogi, Rajat
Published in: International Journal of Civil Engineering
Abstract: Sufficient literature is available on approaches to deal with heterogeneous traffic on mid-blocks in developing countries, but not much work is done on roundabouts. The estimation of passenger car unit (PCU) for different vehicles to convert heterogeneous traffic into homogeneous traffic is a well-accepted procedure. But the parameters used for mid-blocks may not be helpful on roundabouts as traffic flow characteristics on the two locations are different. Suggested PCU values on roundabouts from developing countries are not recent, and needs a relook. It is also not clear whether to use static or dynamic PCU values on account of possible temporal and spatial variations across locations. This paper presents an estimation approach for PCUs on roundabouts and suggests using static value instead of dynamic. The problem to deal with re-estimation of PCU values at different locations, due to possible traffic flow variations, is dealt with by proposing a heterogeneity equivalency factor (H-Factor). The factor is multiplicative and converts heterogeneous traffic (veh/h) into homogeneous traffic (pcu/h). ¬© 2017, Iran University of Science and Technology.
Citation: International Journal of Civil Engineering(2017), 15(4): 585-598
Issue Date: 2017
Publisher: Springer International Publishing
Keywords: Heterogeneity equivalency factor
Heterogeneous traffic
Lagging headway
Passenger car unit
ISSN: 17350522
Author Scopus IDs: 56985078000
Author Affiliations: Ahmad, A., Department of Civil Engineering, Glocal University, Saharanpur, India
Rastogi, R., Department of Civil Engineering, Indian Institute of Technology, Roorkee, India
Corresponding Author: Rastogi, R.; Department of Civil Engineering, Indian Institute of TechnologyIndia; email:
Appears in Collections:Journal Publications [CE]

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