The tipping point was in the 1950s, when the futile attempt began to build sufficient road capacity to "solve" the traffic congestion problem. As experience around the world shows us, you cannot build your way out of road congestion - as road capacity is increased, people drive more and drive further, leading to yet more congestion.
Even John Merritt, the current VicRoads CEO, has acknowledged that.http://www.theguardian.com/australia-ne ... oads-chief
Building more and more major road capacity to overcome congestion equates to Einstein's (alleged) definition of insanity - doing something over and over again and expecting a different result.
It's vital that we give priority to sustainable transport modes. In fact, as noted by one of John Merritt's predecessors, David Anderson, congestion is a much underrated traffic management tool.