Is Lui Tuck Yew kidding?

‘Given Singapore's limited space for new roads, the government plans to further curb vehicle growth from next year, revealed Transport Minister Lui Tuck Yew.’ This is quoted from Yahoo News.

We have just heard of a White Paper discussing about Singapore having a population of 7m from the current 5.3m. Can the island have enough space for an additional 1.7m people when it cannot find space for