Patterson Road is a major road between Kwinana and Rockingham and is part of Australia's National Route 1 for part of its length. The first part goes through Kwinana's heavy industrial area. After the Ennis Avenue turnoff which takes Highway 1 with it, Patterson Road becomes State Route 18 and goes through the Rockingham Beach area until it turns into Railway Terrace one block from the ocean at Mangles Bay, which is part of the Indian Ocean.