NickiB:Evolbob: The problem I posed was IMHO never addressed, that was how will years (33) of doing it one way will be overcome when the rules change?
Apparently it will not be a problem:
"When a similar change was made in Victoria, Australia in 1993 the crash rate actually dropped in the period immediately after the change and remained lower. A key reason for this was the widespread publicity about the change. It is also possible that people drove more carefully and were more watchful of others as they adjusted to the change." (link)
It wasn't a problem, I lived there when it happened. It was brilliant and improved traffic flow tenfold.
People also have to think that in the majority of cities, there is a right turn lane and not normally a left turn lane, so one car can hold up hundreds of cars going straight by not moving to the left to execute their left turn while the right turn lane from oncoming traffic ends up empty. This causes the knock-on effect where cars 3 intersections back are now stopped (a real pain is trucks in the queue that go through 9 gears to get to 50km/h again). Anybody here ever driven down Petone esplanade towards Seaview after 3pm on a weekday?
All this can be avoided by allowing the ONE car turning left to go and the car coming from the opposite direction, in a turning lane (or as close to the centreline as possible), can wait for a break in traffic.
You don't think that experts in cities with a population bigger than all NZ have thought about the rules and found the best way to keep traffic flowing? I know Melbourne traffic got better nearly overnight!
Bring the change!
Now, if only NZ drivers tried not doing-90-and-then-speeding-up-in-passing-lanes...
disclaimer: I drive trucks both linehaul and local so my opinion may be biased, but I have seen this work and would love it to change in NZ... ASAP.