The final length of the A1 to have dual carriageways in the North Riding was the by-pass of historic Boroughbridge, some 4½ miles in length and, with alteration to side roads, was completed in 1963 at a cost of £1.6million. The length of by-pass south of the River Ure was in the West Riding, and it was agreed that the scheme, the last major project on the A1 to be designed by the North Riding County Council, should be constructed by its Direct Labour Organisation.

Bridge design and carriageway construction were similar to those used on the Leeming By-pass except for the bridge over the River Ure, where a double-cantilever and suspended span design was adopted. The steelwork in the superstructure of this bridge was fabricated and erected by Dorman Long.

Prior to the construction of the by-pass, the County Surveyor had visited the M1 and seen the use of in situ kerbing. On his return he demanded that a design for, and fabrication of, moveable shutters should be undertaken within the week. The design was a scissor arrangement using 10 ft. long side shutters with levelling screws at each corner, and the fabrication was undertaken in the County's Central Depot. The shutters proved to be very successful in that, by using a fairly dry concrete mix they could be moved to the next section within 3 to 4 hours.

The length of kerbing laid in a day was phenomenal. Three times as quick as hand laying by workman and at 40 per cent of the cost.

The introduction of the recommendations of the Worboy's Report on signs coincided with the construction of the by-pass. This became the first length of the A1 in the North Riding to incorporate the larger signs with green backgrounds, although great difficulty was experienced in finding a firm capable of producing the "new" type signs.