A new two-lane road is being built to link motorists directly from the Pan-Island Expressway to Changi Airport's upcoming Terminal 4.
Motorists can also access the other terminals from T4 via an existing underpass. Those leaving T4 for the city will be able to use a new road that will connect to the East Coast Parkway.
The new roads, to be completed by the year end, will provide motorists with easy access to and from T4, which opens in the second half of next year, Changi Airport Group spokesman Ivan Tan told The Straits Times.
Two other new bridges have also been built across Airport Boulevard Road - one for pedestrians and the other for restricted vehicles moving from T4 to a new area for aircraft parking, he said.
With construction of the external facade almost completed, the focus will soon shift to getting the interiors done up and ensuring T4 is ready for operations.
T4, which will house several carriers including Cathay Pacific and AirAsia, will be able to handle up to 16 million passengers a year.
Unlike the other three terminals, it will see a massive roll-out of self-service and automated options for check-in, bag tagging, immigration clearance and aircraft boarding.
Passengers will also be subject to centralised screening instead of being screened at the gatehold rooms just before boarding - the system in place at the other terminals.
To minimise teething problems, intensive trials will be conducted starting from later this year.
Mr Tan said there are plans for more than 50 trials, including live flights, ahead of T4's opening. This is more than double the number of trials for T3.
There are also new arrangements for travellers moving between T4 and the other terminals.
With no Skytrain linking T4 to the other facilities, those with connecting flights will be moved to a transfer lounge where they will be bussed to T2. They can take a Skytrain to T1 and T3 from there.
As part of the developments, T4 will have its own 68m-high ramp control tower, which should be ready in the second half of next year. The tower will oversee and manage aircraft movements in T4's apron and surrounding taxiways.
Mr Tan said: "This tower is needed to enhance the air traffic controllers' visual line of sight of aircraft parking stands and associated taxiways near the southern end of Runway Two."