I saw some of these zig zag type markers the other day at Curtin uni then on Murray Street in Perth.

If you want to get some detailed information on why the different city councils chose them, try www.cityofperth.wa.gov.au or www.curtin.edu.au.

I can always ask my planning professor for more information if you'd like. (brownie points ) Hmmm..perhaps next semester it might come up in the Transportation & Society class? Good question for the planning student