Lion Rock Tunnel
After Kowloon Bay, the road makes a few sharp bends before entering Lung Cheung Road. The route continues heading west and passes through the suburbs of Diamond Hill, Wong Tai Sin and Wang Tau Hom. The road becomes considerably steeper near the exit for Lion Rock Tunnel, and follows the foothills of northern Kowloon. At Tai Wo Ping, the route interchanges with Tai Po Road and continues as Ching Cheung Road, bypassing Sham Shui Po and Cheung Sha Wan before terminating at Kwai Chung and joins Route 5 again.