Year: 2006-2007

Client: Parsons Brinckerhoff Pte Ltd and Land Transport Authority

Tasks: To conduct traffic study for the proposed tunnel and conduct road safety audit

Marina Coastal Expressway (MCE) comprised a multi lane dual carriageway tunnel connecting the East Coast Parkway (ECP) / Kallang Paya-Lebar Expressway (KPE) Interchange in the northeast and to Ayer Rajah Expressway (AYE) / ECP Interchange in the south-west. The expressway was designed to carry up to 11,000 vehicles per hour per direction during peak periods. Duffill Watts heading by Ali was appointed to carry out a road network analysis for the proposed tunnel and the roads connecting to this new road system. VISSIM microsimulation models were developed and models showed two major deficiencies: 1) the number of lanes for the proposed tunnel for the future traffic demands, were inadequate and an extra lane was needed for both bounds and 2) the South Quay viaduct would have had insufficient lanes when connected to the MCE. Both recommendations were adopted in the design resulting a 6-lane bound each direction for MCE and widening of South Quay viaduct from three to four lanes each direction. The viaduct was later widened. Ali was later appointed as the road safety auditor to conduct a detailed design road safety review for the overall 6km of MCE tunnel.