01594583

Component

The motive of the study is to estimate the capacity of U-turns at uncontrolled median opening keeping an eye on heterogeneous and peculiar driving characteristics prevailing in India. For estimation of capacity Harders’s formula was used and this formula requires three basic parameters, namely, conflicting traffic volume, critical gap and follow-up time. In this regard, data were collected at different uncontrolled median openings of India. A practical approach was developed, by studying the lateral placement of vehicles at the median opening area, for better estimation of conflicting traffic volume. Four different critical gap estimation procedure, namely; modified Raff, maximum likelihood, macroscopic probability equilibrium, and merging behavior were utilized for estimation of critical gap. The follow-up time was measured in the field directly and utilizing the findings of these studies capacities of individual categories of U-turning vehicles were estimated, subsequently the capacity of U-turning traffic stream was calculated. The estimated capacity using Harders’s formula was tested against the field capacity measured in the field using the Kyte’s method. Two statistical parameters were employed and the capacity estimated using the critical gap value obtained from merging behavior approach was found to be in close agreement with the estimated field capacity.

This paper was sponsored by TRB committee AHB40 Standing Committee on Highway Capacity and Quality of Service.

01584066

16-3303

English

22p

2016

Transportation Research Board 95th Annual Meeting

Digital/other

Figures; References; Tables

Gap acceptance; Highway capacity; Median openings; Merging traffic; Traffic volume; U turns

India

Highways; Operations and Traffic Management; Planning and Forecasting

Transportation Research Board Annual Meeting 2016 Paper #16-3303

TRIS, TRB, ATRI

Jan 12 2016 5:27PM