01477069

Component

Unsignalized intersections in India are uncontrolled, and are characterized by chaotic traffic situation and have become accident hot spots. In this study, we have collected traffic data at seven uncontrolled intersections by video recording; of these, data for three intersections each of different type is extracted and analyzed so as to understand different traffic parameters such as traffic composition, speed variations, lane distribution, trajectories, conflict points, and pedestrian movements. At each intersection, three cameras are used to record the traffic simultaneously from different angles. Among the intersections for which data are extracted, one each is from city centre (Type I), suburb (Type II), and outskirt (Type III). Type I intersection has a large number of slow moving vehicles interacting with closely spaced other vehicles and pedestrians. Type I intersection has more than 70% vehicles as two-wheelers; the proportion at type II and type III intersections are about 50%. All the vehicle classes prefer inner lane, except auto-rickshaws. The speed on inner lane is higher than outer lane vehicles as latter are affected by the roadside friction. It is also found that the minor approach vehicles have to slow down or stop many times. Right turning two-wheeler trajectories are studied which showed that the trajectories are much flatter than the trajectories in the standard conflict point diagram. Consequently the conflict points of right turning two-wheelers are moved apart from each other creating a rhombus instead of standard rectangle. Vehicle-pedestrian conflicts are very critical as many pedestrians try to walk the shortest distance without giving much attention to their safety. This study has great potential in assessing the performance and safety of an unsignalized intersection in India.

This paper was sponsored by TRB committee AHB45 Traffic Flow Theory and Characteristics.

01470560

13-4254

English

14p

2013

Transportation Research Board 92nd Annual Meeting

Digital/other

Figures; References; Tables

Microscopic traffic flow; Pedestrian movement; Slow moving vehicles; Traffic characteristics; Traffic conflicts; Traffic data; Two wheeled vehicles; Unsignalized intersections; Vehicle trajectories

India

Highways; Operations and Traffic Management; I73: Traffic Control

Transportation Research Board Annual Meeting 2013 Paper #13-4254

TRIS, TRB, ATRI

Feb 5 2013 12:49PM