 The A3 runs from its intersection with the A8 at Mona Vale at the north end, to the southerly of its two intersections with A1, the Princes Highway, at Blakehurst the south end.The highest speed limit on the (A3) is on Mona Vale Road.It is a major connector between most of the major radial routes emanating from central Sydney, and a major link between the northern and southern parts of the Sydney tolled orbital freeway.