A Study of the Flyover-Bridge Intersection – Improved Junction
Narabodee Salatoom, Pichai Taneerananon · Engineering Journal · 2015
To reduce traffic congestion at an at-grade intersection near a big city, one method is construction a flyover bridge at the old junction in two directions on one of the main highways.The flyover facilitates the traffic flow in the directions of the bridge, but the infrastructure cannot fully solve all of the problems especially on the secondary road.Under the bridge, although it relieves the traffic congestion at the intersection; the traffic signal still uses the same control as the "before" situation, that is the fixed time control plan.With the flyover bridge in place, it was found that about 30-35% of all traffic volumes diverted to the bridges, and time delay reduced by 30% over the same period.This paper which is one part of the first author's thesis, presents the issues that still exist at the flyover-improved junction and makes suggestions to increase the benefits of the flyover such as creating a new cycle and phase times and improving the physical area under the bridge.The SIDRA software is used to determine the appropriate fixed time plans, and using the process of Road Safety Inspection (RSI) to audit the safety of the site and presents the improvements to the remaining problems.