From the DfT:
As part of the Transport Investment Strategy, the government committed to creating a Major Road Network (MRN).

This consultation asks for views on:
how to define the MRN
the role that local, regional and national bodies will play in the MRN investment programme
which schemes will be eligible for MRN funding

A new MRN would help deliver the following objectives:
reduce congestion
support economic growth and rebalancing
support housing delivery
support all road users
support the Strategic Road Network

The creation of an MRN will allow for dedicated funding from the National Roads Fund to be used to improve this middle tier of our busiest and most economically important local authority ‘A’ roads.