The National Government's $212 million plan to fast-track regional road projects using asset sales cash is not backed by a strong economic case, documents released under the Official Information Act show.
Opposition MPs have labelled the projects a cynical bid to buy votes.
The regional road and bridge projects, many of them in Cabinet Ministers' electorates, were announced at the National Party conference in late June.
Documents released to Labour strategist and blogger Rob Salmond by Transport Minister Gerry Brownlee's office show most of the 14 projects have a benefit to cost ratio of less than four with five in the range of 0 to 2.
Green Party transport spokeswoman Julie Anne Genter said that meant they were relatively uneconomic compared to many other projects awaiting funding under the New Zealand Land Transport Agency's plans.