A Dutch gentleman is proposing a banked circular runway, about 2 miles in diameter, as a solution for airport design problems.
The idea is apparently not fanciful. The only problem I can see is that, if the rest of the world decides to go clockwise, CASA will insist that all Australian circular runways must go anti clockwise.
http://www.curbed.com/2017/3/24/1504...airport-design