Singapore's road network is regarded as one of Asia's best example of excellent urban planning. Traffic crawls are uncommon in Singapore, save it for during special events or major road closures. In short, my experience in driving within Singapore was a pleasant one.
ALLEVIATING TRAFFIC JAMS:
There are a number of methods devised by Singapore's Land Transport Authority (LTA) to alleviate traffic backlogs. The most important one is probably the introduction of Certificate of Entitlement (COE) which comes at different prices for those wishing to own a car in the city state. On the other side, the extensive network of MRT, LRT and SBS Transit buses has made it rather unnecessary to own a car in Singapore. Movement of cars are further restricted with the introduction of Electronic Road Pricing (ERP) which charges car owner certain toll fees during peak hours.
As a result, Singapore seems to barely have any cars on the street. Indeed, their model of traffic controls is worth a second look.
NETWORK OF EXPRESSWAYS:
Singapore has a number of expressways (or highways) that transverse the city-state east to west and north to south. Driving along these expressways is a breeze and pleasant. Singaporean vehicles seemed to follow the speed limit of 90km/h until they enter into Malaysian highways (OK, that is a little much irrelevant information). Traffic enforcement is so good that cameras and speed traps are installed throughout the routes to ensure nobody is driving dangerously.
The two main expressways that you will encounter if you are entering from Johor Bahru and Tuas are Bukit Timah Expressway (BKE) and Ayer Rajah Expressway (AYE), respectively. Driving along the latter will bring you directly into downtown Singapore, while the former will merge into Pan Island Expressway (PIE) and Central Expressway (CTE) to the city centre. Also, the AYE will merge into East Coast Parkway at downtown Singapore and will bring you directly to Changi International Airport.
There are 3 minor expressways that transverse in the heartland, namely Kranji Expressway, Seletar Expressway and Tampines Expressway.