http://www.onemotoring.com.sg/publish/onemotoring/en/on_the_roads/road_closure.htmldat's one of the reason...
National Day Investiture 2006 (13 November 2006)
The following roads / lanes will be closed to traffic from 5.00 pm to 11.00pm.
· West-bound Nicoll Highway between Republic Avenue and Bras Basah Road; and
· One carriageway of Temasek Boulevard between Raffles Boulevard and the Fountain of Wealth roundabout.
secondly, the singapore flyer project, linking of some link bridge, happens to be on same day... anyone who went pass raffles boulevard and saw the sign can confirm this?