NEWS.com.au | Traffic chaos on M4 in Sydney's outer west after truck hits overpass NEWS.com.au COMMUTERS from Sydney's west are in for a chaotic morning after an overheight truck damaged an overpass, forcing the closure of two M4 lanes. news.com.auAugust 9, 20188:57am. Two eastbound M4 lanes are closed at Colyton after an overheight truck ... Truck crashes into M4 overpass closing two lanes Truck causes traffic jams in Sydney's west Originally published as Massive traffic backup on M4 |