Though the expressway begins in Gombak, the zeroth kilometer is not there; instead it is located at the intersection of Jalan Pahang (part of Highway 2) and Jalan Tun Razak, near the Kuala Lumpur Hospital, and counted along Jalan Pahang and Jalan Gombak. The Gombak toll plaza is located at the 19th kilometer, close to the International Islamic University Malaysia. The Karak Expressway is almost parallel to the old Gombak–Bentong road 68, crossing some villages in the Gombak constituency, before crossing the Selangor–Pahang border at the Genting Sempah Tunnel. Exits to Genting Highlands are built at both ends of the tunnel. There is a rest stop with a McDonald's outlet just after the eastern end of the tunnel.