LTA Contract Er393 – Flyover at West Coast Highway


 Year: 2013-2015

Client: Chye Joo Construction Pte Ltd Land Transport Authority

Tasks: Develop Road diversion schemes, TIA study and travel time survey, swept path analysis

Construction of the proposed flyover at West Coast Highway across Jalan Buroh involved many challenges. The new flyover runs over a major roundabout connecting to industrial areas and a large volume of heavy vehicles use the roundabout. The flyover was needed to carry projected traffic east to west as the main highway. The roundabout was planned to change to a major signalized cross-junction once the flyover was built. Therefore, careful planning to develop road diversion schemes was required. To achieve safe and efficient road diversion at each stage, LTA requested for travel time survey at each stage and a TIA study to ensure minimum impact is caused specially to heavy vehicle movements due to high economic interest in this area.
LTA provided its own preliminary nine stage road diversion plans to the contractor. Subsequently, the contractor engage TCP Solutions to review the plans. It was realized the plans were not workable and Ali and his team developed alternative 5 stage plans to suit contractor’s goal to achieve cost effective and shorter time schemes to complete the construction. To satisfy the authority with the proposed plans, VISSIM microsimulation traffic assessment was carried out for the critical stages by conducting traffic and travel time surveys, and develop the models. The TIA study indicated that plans were workable and LTA approved the plans. The contractor managed to complete the project ahead of given time saving on cost as well.

Flyover under construction over the existing roundabout
Figure 1. Flyover under construction over the existing roundabout
Roundabout connecting major arterial roads
Figure 2. Roundabout connecting major arterial roads
VISSIM microsimulation showing the existing roundabout layout
Figure 3. VISSIM microsimulation showing the existing roundabout layout
Road diversion plan
Figure 4. Road diversion plan for stage 2
Road diversion plan for stage 3
Figure 5. Road diversion plan for stage 3