I dont think that is really the reason, Transmission Gulley isnt opening for another 2 years. The choke points for Wellington will be adjusted to be SH1 at approx Porirua, there is no improvement on the bad parts of the city like Terrace Tunnel, the Basin Reserve, Vic tunnel and Evans Bay.
Since the expressway opened the hold up at Paekakariki is horrendous at peak mornings, it has been very effective in moving a lot of traffic to a small roading area.


