The sections from Miri to Limbang and to Lawas are connected by Brunei highway networks.

At the Sarawak-Sabah border at Merapok, motorists must pass an immigration checkpoint to enter Sabah and vice versa.

The highway continues as Malaysia Federal Route 1 (Sabah) in Sindumin.

After the Federal Roads Act 1959 was made effective in Sabah and Sarawak in 1984, those highways were re-gazetted as federal highways in 1996 with the route number of FT1 (from Sematan to Kudat through Brunei), FT13 (Mile 32 Sandakan to Tawau) and FT22 (Tamparuli to Sandakan).

[8][9] A study to upgrade the entire highway to a super two highway under JKR R5 standard (design speed limit: 100 km/h; minimum lane width: 3.5 m) was done, which was expected to cost RM16 billion.