Here's an interesting film by Mike Rubbo, documentarist turned bicycle advocate, who traveled north to Darwin, Northern Territory to explore the territory's unique bike helmet excemption law. The Northern Territory mandated helmet use along with the rest of the country in the 1990's. Like the rest of the nation, they saw cycling levels drop. In an attempt to get people to ride again, they repealed - or rather adjusted - the law and allowed for helmet-free cycling on footpaths and bike paths.
The result? It's in the film and in Mike's post over at his SitUp-Cycle.com blog.
It's been 20-odd years since I was last in Darwin. Maybe I could find a travel agency specialising in Rationality Destinations and get me a ticket to the 'top end's' bicycle paradise.