The Thomson Road circuit was a 3.023 mile circuit used from 1961 to 1973. It was used for motorbike and car races, but after a series of fatalities racing was halted. The 1961 version of the circuit featured several chicanes were in place, but for the following year most of these chicanes were removed - with the exception of a bus-stop like one located at a bus stop itself prior to the hairpin near Sembawang Hills Circus.
Click here for a map showing an earlier variant which had a hairpin rather than going around the circus.
In 2006 it was announced that Singapore was talking with Bernie Ecclestone about hosting a Grand Prix in 2007 or 2008. The government commissioned Hermann Tilke to design the 4.8 km circuit shown above. It bears a strong resemblance to a circuit diagram published in a research project by Cheng Khim Seng some two years earlier. The circuit was revised to create the 5.067 km circuit which is shown below - it hosted the first F1 night-race on the 28th September 2008.
In 2015 turns 11 and 12 were reprofiled, the road going over the other side of the Anderson bridge. The circuit length was 5.065 km. The reprofiled corner is shown below.