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The expansion of the slip road, which will create a third lane on the PIE, as well as the relocation of Exit 1 further away from the airport, are to add capacity and smoothen the flow of traffic to the airport.
http://brain.sg/article/new-lane-added-to-pie-ahead-of-changi-jewel-s-opening-139705
Brain - New lane added to PIE ahead of Changi Jewel's opening
Key Highlights

A new lane has been added to the Pan-Island Expressway (PIE) towards Airport Boulevard, ahead of the opening of Jewel Changi Airport, which is expected to attract large crowds

The expansion of the slip road are to add capacity and smoothen the flow of traffic to the airport

A spokesman for Changi Airport Group (CAG) told The Straits Times that the airport worked closely with the Land Transport Authority to extend the filter lane from Changi North Crescent to the PIE, into a full lane

Lee Der-Horng is not sure it will make a huge difference

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The Straits Times