The Kilometre Zero of the Federal Route 100 starts at Simpang Empat, Teluk Muroh junctions, at its interchange with the Federal Route 18, connecting Lumut to Sitiawan.
At the Kilometre Zero of Federal Route 100, the route commences at Simpang Empat, Teluk Muroh junctions, merging with Federal Route 18 and connecting Lumut to Sitiawan.