The North–South Expressway is a network of tolled controlled-access highways running through the west coast of Peninsular Malaysia. The expressway network consists of the northern route and southern route, having a total length of 772 kilometres. Running through seven states and connecting the Thailand and Singapore borders, the North–South Expressway is an important thoroughfare for local, interstate and international traffic. The expressway is part of route AH2, a designation of the Asian Highway Network.

The North–South Expressway Northern Route is an interstate controlled-access highway running parallel to the northwestern coast of Peninsular Malaysia. The 460-kilometre (290-mile) expressway forms the north section of the North–South Expressway, passing through the northwestern states of Kedah, Penang, Perak and Selangor. The expressway begins at the Bukit Kayu Hitam checkpoint in Kedah, where the Malaysia–Thailand border lies, and ends at Bukit Lanjan in Selangor state where the expressway interchanges with the New Klang Valley Expressway. The expressway is operated by PLUS Expressways.