01520277

Component

https://doi.org/10.3141/2461-16

Capacity analysis of unsignalized intersections is done primarily with gap acceptance principles. The vehicles on lower-priority approaches maneuver when a suitable gap is available in higher-priority conflicting streams. Although temporal gaps are widely used, some researchers advocate the use of spatial gaps. The focus of this study was on analyzing temporal and spatial gaps at four-legged, partially controlled intersections in India. Unlike in developed countries, unsignalized intersections in India are not controlled with stop and yield signs with explicit priorities. The priorities are mainly set by the situations drivers perceive. Field data were collected at three four-legged intersections with video cameras. Temporal and spatial critical gaps were estimated with Raff’s, logit, lag, Ashworth’s, and maximum likelihood methods. The values of temporal critical gap by different methods were found to vary between 3.0 and 3.9 s. The spatial critical gap values varied from 29 to 36 m. These values were smaller than the similar values reported in developed countries, indicating aggressiveness in Indian drivers. The insights from this study can be used for the capacity analysis of unsignalized intersections in India.

01557687

14-4837

English

pp 129–136

2014

Transportation Research Record: Journal of the Transportation Research Board

9780309295550

Print

Figures (10) ; References (20) ; Tables (5)

Developing countries; Four leg intersections; Gap acceptance; Highway capacity; Secondary roads; Spatial analysis; Unsignalized intersections

Temporal analysis

India

Highways; Operations and Traffic Management; Planning and Forecasting; I70: Traffic and Transport

TRIS, TRB, ATRI

Jan 27 2014 3:42PM

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