The North–South Expressway Monument was erected at Rawang Rest and Service Area (R&R) (North bound) near Rawang, Selangor on 8 September 1994. A capsule was put in place that contains documents that have been cultivated by the fourth prime minister of Malaysia, Tun Dr Mahathir Mohammad in conjunction with the official opening of the North–South Expressway on 8 September 1994. The capsule will be released after the expiry of the concession of the North–South Expressway by PLUS Expressways on 31 Dec 2038.