Editing Sydney Harbour Bridge (section)

===75th anniversary===
[[File:SHB75.jpg|thumb|upright|Walkers with LED caps on the bridge's 75th Anniversary]]
[[File:Shb75thhats.jpg|thumb|right|The commemorative hats given to walkers]]
In 2007, the 75th anniversary of its opening was commemorated with an exhibition at the [[Museum of Sydney]], called "Bridging Sydney".<ref>[https://web.archive.org/web/20070927050000/http://www.hht.net.au/bridgingsydney Bridging Sydney] [[Historic Houses Trust, New South Wales]]</ref> An initiative of the [[Historic Houses Trust, New South Wales|Historic Houses Trust]], the exhibition featured dramatic photographs and paintings with rare and previously unseen alternative bridge and tunnel proposals, plans and sketches.<ref>{{cite web |title=Bridging Sydney |url=https://sydneylivingmuseums.com.au/exhibitions/bridging-sydney |website=Sydney Living Museums |access-date=18 March 2020 |date=17 January 2014 |archive-date=7 August 2020 |archive-url=https://web.archive.org/web/20200807232039/https://sydneylivingmuseums.com.au/exhibitions/bridging-sydney |url-status=live }}</ref>

On 18 March 2007, the 75th anniversary of the Sydney Harbour Bridge was celebrated. The occasion was marked with a ribbon-cutting ceremony by the [[Governor of New South Wales|governor]], [[Marie Bashir]] and the [[Premier of New South Wales]], [[Morris Iemma]]. The bridge was subsequently open to the public to walk southward from Milsons Point or North Sydney. Several major roads, mainly in the CBD, were closed for the day. An [[Australian Aborigines|Aboriginal]] [[smoking ceremony]] was held at 7:00pm.<ref>{{cite web|url=https://ma.as/375296|title=Cap marking 75th anniversary of Sydney Harbour Bridge|author=Museum of Applied Arts & Sciences|publisher=Museum of Applied Arts & Sciences, Australia|access-date=13 August 2019|archive-date=24 September 2023|archive-url=https://web.archive.org/web/20230924100452/https://collection.powerhouse.com.au/object/375296|url-status=live}}</ref><ref>{{cite web|url=https://pictures.reuters.com/archive/AUSTRALIA-BRIDGE--GM1DUVNVPKAA.html|title=REUTERS|date=18 March 2007|access-date=13 August 2019|archive-date=13 August 2019|archive-url=https://web.archive.org/web/20190813125027/https://pictures.reuters.com/archive/AUSTRALIA-BRIDGE--GM1DUVNVPKAA.html|url-status=live}}</ref>

Approximately 250,000 people (50,000 more than were registered) took part in the event. Bright green souvenir caps were distributed to walkers. A series of speakers placed at intervals along the bridge formed a [[sound installation]]. Each group of speakers broadcast sound and music from a particular era (e.g. [[Edward VIII|King Edward VIII's]] abdication speech; [[Gough Whitlam]]'s speech at [[Old Parliament House, Canberra|Parliament House]] in [[1975 Australian constitutional crisis|1975]]), the overall effect being that the soundscape would "flow" through history as walkers proceeded along the bridge. A light-show began after sunset and continued late into the night, the bridge being bathed in constantly changing, multi-coloured lighting, designed to highlight structural features of the bridge. In the evening the bright yellow caps were replaced by orange caps with a small, bright [[Light-emitting diode|LED]] attached. The bridge was closed to walkers at about 8:30pm.{{citation needed|date = March 2014}}