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Published February 1st 2012
View of the Harbour Bridge from ferry. The bridge is equipped for tidal flow operation, permitting the direction of traffic flow on the bridge to be altered to better suit the morning and evening rush hours' traffic patterns.
The bridge has eight lanes in total, numbered one through eight from west to east. Lanes three, four and five are reversible. One and two always flow north. Six, seven and eight always flow south. The default is four each way. For the morning rush hour, the lane changes on the bridge also require changes to the Warringah Freeway, with its inner western reversible carriageway directing traffic to the bridge lane numbers three and four southbound.