Major changes to trunk roads normally arise from the Government's programme of multi-modal or road based studies and this process involves full local and region wide consultation with statutory bodies and local stakeholders. This would include both the local highway and planning authorities. Once the Highways Agency is asked to develop schemes in more detail local public consultation is carried out into options.
Neighbouring authorities would normally be invited to comment on proposals if the road changes could significantly affect traffic in their area. Should orders under the Highways Act be required there would be further opportunity for comment.