Manchester Friends of the Earth.
Good analysis of this retro road building project. The usual story of flawed economic modeling (or possibly modeling conducted to support a favoured project).
Above all we have to ask why in this time of imposed austerity our councils are planning to spend £300M of our money on a white elephant whose construction will be complete when the airport begins its long decline following an inevitable rise in fuel prices.
Steady State Manchester 
The SEMMS report and evidence is questionable to say the least:
Promoting fairness …
“Support lower carbon travel …
“Improve safety of pedestrians and cyclists …
Do the people producing these reports have any credibility??