A construction company has entered into an Early Contractor Involvement agreement with Gloucestershire County Council.
Cowley-based Galliford Try will design the proposed improvements to junction 10 of the M5, near Cheltenham. The improvements will be funded through the council's successful bid to the government's Housing Infrastructure Fund, administered by Homes England, for £249m.
If planning is approved, the infrastructure project will include a new slip road onto the M5 southbound and another off the M5 northbound to create an "all-movements" signalised junction.