The £1.6m contract for the White Mare Pool to Black Fell improvement of the A1 to dual carriageway standard and now designated A194(M) was undertaken by Brimms & Co Ltd. Work started on the contract in April 1968 and was completed in March 1970. The scheme included the construction of the Havannah Interchange with the B1288, the Follingsby Interchange and the A195 and Peareth Hall overbridge. The scheme was designed by the Durham County Council Sub-Unit of the NERCU.