The new TE32/CR1 Changi Terminal 5 interchange will connect the airport terminal directly to the city centre and other major hubs.
Many other Asian airports like those in Bangkok, Tokyo, Shanghai and Hong Kong, provide a rail option - in some cases, an express service - for travellers.
Analysts say that the Government's decision will end years of such talk, and that this move will ensure Changi's service standards won't suffer.
The Thomson-East Coast Line (TEL), currently being constructed, could be extended to connect to the Changi Airport MRT station, as well as upcoming Terminal 5.
Heavy vehicle drivers have been caught speeding and making illegal U-turns along Changi Coast Road, near the Changi Airport Terminal 5 worksite.
New roads and wider expressways are being planned to cater for increased traffic volumes when Changi East is fully developed.
Work has begun on the biggest airport project ever, which involves expanding and replacing roads in the Changi area to make way for the new Terminal 5.