 The main road to the remaining northern beach suburbs, up to Palm Beach, is Barrenjoey Road, which appears to be a continuation of Pittwater Road at Mona Vale.Being the largest single arterial road in the area, it is often referred to simply as "the main road".In former times, much of present-day Mona Vale Road through St. Ives, Terrey Hills and Ingleside, was known by varying names, including "Pittwater Road".