The new 21.5-kilometre expressway will cost about S$7.47 billion when fully completed by 2029 and will connect the East Coast Parkway with the northern parts of Singapore.

Due to the need to conserve space in land-scarce Singapore, there are no cloverleaf interchanges on the entire island as they are too large.

The most common forms of highway-road or highway-highway intersections are single-point urban, diamond, and trumpet interchanges.

The shoulder is designated for stops in cases of breakdowns and emergencies, and driving on it is prohibited by law.

Crash barriers, cat's eyes and rumble strips are also used to ensure road safety.

There are signs marking the start and end of an expressway at its entry and exit points respectively.

They are assigned with three-letter codes named after their respective initials where the last letter is always E; for example, PIE for the Pan Island Expressway.

However, much like with the expressways, semi-expressways allow motorists to travel quickly from one urban area to another with the use of viaducts, overpasses and tunnels.