Transport Minister Steven Joyce appears to have picked up and run with an international campaign by the trucking industry to increase truck size from 44 to 50 tonnes.
The US Coalition for Transportation Productivity is currently lobbying Congress for a similar size increase.
Stuff reports that Steven Joyce as saying that
allowing truckies to carry heavier loads on some roads could boost GDP by up to $500 million a year.
He notes that trials were undertaken during 2008 and that carrying bigger loads
could boost productivity by 10 to 20 percent, reduce trip numbers by 16 percent and see fuel use drop by 20 percent.
Joyce's assertion of economic benefits fails to take account of a couple of key infrastructural issues - an expensive-to-maintain, winding, narrow roading system in New Zealand which is ill-suited to large trucks, together with an under-utilised rail network.
I'm the first to agree that rail isn't the answer to everything but - leaving aside urgent deliveries, livestock and some perishable items - a goods train, with one locomotive and one driver, can move an awful lot of stuff at once.
Wairarapa residents are only too aware of the problem of large trucks. The "inland port" at Waingawa is under-utilised, while logging trucks carry large and precarious loads over the Rimutaka Hill. They deposit logs right alongside the railway siding on the Wellington wharves.
If Waingawa was used as intended - as a transport hub - local truckies could pick up and deliver much currently wearing out the Rimutaka Hill.
I'd have liked to have seen results of the 2008 heavy truck trials - and comparison with the economics of using rail - but the NZ Transport Agency site only contained technical details of the proposed change.