Malaysia Federal Route 1 (Sarawak)

The Sarawak section of the Federal Route 1, Asian Highway Route AH 150, is a 1077-km federal highway in Sarawak, Malaysia, making the highway as the longest component of the Malaysian portion of the larger Pan Borneo Highway network. Construction of the highway began right after Sarawak became a member of the federation of Malaysia in 1963.

The Federal Route 1 was built in sections, comprising 92 sections altogether. Generally, all other federal and state highways in Sarawak serve as tributaries of the Federal Route 1. The highway is the only east-west oriented highway in Sarawak and links most of the division capitals in Sarawak except Kapit and Mukah. 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.

Even though some sections of the highway has been upgraded to dual-carriageway such as the Kuching-Serian Highway (Sections 13-16), the overall condition in many sections of the highway is poor with many potholes, because most sections of the highway were built with standards as low as JKR R3 (design speed limit: 70 km/h; minimum lane width: 3.0 m). A study to upgrade the entire highway to JKR R5 standard (design speed limit: 100 km/h; minimum lane width: 3.5 m) is underway, which is expected to cost RM16 billion.