Automatic Grade and Quad Crossing Safety and Delay Optimization in Addis Ababa LRT
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Date
2016-06-20
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Addis Ababa University
Abstract
The implementation of Light Rail Transit System (LRTS) as an integrated form of public transportation, with the rail corridor running through city centers and connecting major commercial centers, presents interference with other modes of transportation especially road transport. So at the intersection of the two modes of transport safety becomes the critical issue. This thesis presents new ideas in developing a system which minimizes the risk at level/quad crossing. So a radar based automatic and coordinated system has developed in this thesis to solve the obstacle detection mechanism in Addis Ababa Light Rail Transit al Level/Quad Crossing (LQC) which is not yet adopted on the line.
After reviewing all the available technologies designed for minimizing risk at level/quad crossing here a radar based safety enhancing technology have been presented. Every specification of 122GHz radar system has been mathematically modeled and simulated.
A coordination algorithm for both modes of transport have been developed so unwanted interference will be mitigated. Here the radar signal is considered as an actuator to control the train and traffic signaling system. In addition to this, an optimization equation for minimizing the risk and time delay; and maximizing track and road utilization have been developed and simulated. It shows as the time delay is reduced to 8.6136sec from 10.6706sec.
A possible interfacing mechanism with the existed system of Addis Ababa Light Transit signaling system has been presented.
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Keywords
Level crossing, Grade crossing, Bi-signaling, Time delay, Quad Crossing, Preemption, train signaling, optimization, traffic light, simplex algorithm