Roads closed for Sydney half marathon Roads around the CBD are closed for Sydney's Half Marathon with motorists advised to avoid the area. ROADS around the CBD are closed for Sydney's Half Marathon with motorists advised to avoid the area. The Cahill Expressway over Circular Quay and sections of the Western Distributor are among the major roads now closed. The Sydney Harbour Bridge and Sydney Harbour Tunnel will remain open but there is no direct link between the Anzac Bridge and Sydney Harbour Bridge. Other affected roads include Sussex, Phillip, Alfred, Loftus and Macquarie streets in the CBD. George Street, Hickson Road and Kent Street in The Rocks are also affected, as well as Pyrmont Street, Pirrama Road, Jones Bay Road and Darling Drive in Pyrmont. The half marathon began at 6.45 am (AEST) and all roads will reopen by 11am.