organised by the Citizens of Sydney Organising Committee, an influential body of prominent men and politicians that formed in 1931 under the chairmanship of the lord mayor to oversee the festivities. The celebrations included an array of decorated floats, a procession of passenger ships sailing below the bridge, and a Venetian Carnival. A message from a primary school in Tottenham, away in rural New South Wales, arrived at the bridge on the day and was presented at the opening ceremony. It had been carried all the way from Tottenham to the bridge by relays of school children, with the final relay being run by two children from the nearby Fort Street Boys' and Girls' schools. After the official ceremonies, the public was allowed to walk across the bridge on the deck, something that would not be repeated until the 50th anniversary celebrations. Estimates suggest that between 300,000 and one million people took part in the opening festivities, a phenomenal number given that the entire population of Sydney at the time was estimated to be 1,256,000. There had also been numerous preparatory arrangements. On 14 March 1932, three postage stamps were issued to commemorate the imminent opening of the bridge. Several songs were composed for the occasion. In the year of the opening, there was a steep rise in babies being named Archie and Bridget in honour of the bridge. One of three microphones used at the opening ceremony was signed by 10 local dignitaries who officiated at the event, Philip Game, John Lang, MA Davidson, Samuel Walder, D Clyne, H Primrose, Ben Howe, John Bradfield, Lawrence Ennis and Roland Kitson. It was supplied by Amalgamated Wireless Australasia, who organised the ceremony's broadcast and collected by Philip Geeves, the AWA announcer on the day. The radio is now in the collection of the Powerhouse Museum. The bridge itself was regarded as a triumph over Depression times, earning the nickname "the Iron Lung", as it kept many Depression-era workers employed. Operations In 2010, the average daily traffic included 204 trains, 160,435 vehicles and 1650 bicycles. Road From the Sydney CBD side, motor vehicle access to the bridge is via Grosvenor Street, Clarence Street, Kent Street, the Cahill Expressway, or the Western Distributor. Drivers on the northern side will find themselves on the Warringah Freeway, though it is easy to turn off the freeway to drive westwards into North Sydney or eastwards to