Proposed speed changes.

Gordon from Halswell

The justification for the increase from 100 to 110kph from Rolleston to Curletts rd is mostly around improving efficiency.
I assumed, (yes, a very dangerous thing to do), that this was meaning that Trucks would increase in speed as well, which would have been a safety issue for me, but was the only logical reason for justifying the change on efficiency grounds.
However, a section off the Gvt site says "The 90km/h speed limit for heavy vehicles and towing vehicles applies on 110km/h roads. Where there are two lanes in each direction, other drivers can safely and easily pass slower-moving vehicles"
If the trucks can not speed up, how are efficiencies going to be made when only smaller vehicles, that can save 2 mins on each trip and Trucks zero?
Am I missing something?