JJC Bradfield: The visionary who built the Bridge | dailytelegraph.com.au: "When the Sydney Harbour Bridge was opened, it was the second longest steel arch bridge in the world, just behind the Bayonne Bridge in New Jersey in the US. (Bayonne was opened one year before and was 504 metres long, compared to the 503 metres of the Sydney Harbour Bridge.)
The Sydney Harbour Bridge was immediately, though, the largest single arch bridge in the world. It is higher above the water level than the Bayonne Bridge, and considerably wider, with six lanes of road traffic, two rail tracks and two tram tracks, compared to Bayonne’s two lanes of traffic each way."