A15 road (England) over the old route of the A15 (B1206) and over the South Trans-Pennine railway. At junction 5, the A15 reforms at the dual-grade "Barnetby Top Interchange", which is crossed by the Viking Way and has an exit to Elsham. It continues north as a dual carriageway which carries about as little traffic as the M180. The M180 drops to two lanes under this roundabout and continues to Grimsby and Immingham as the A180. The A15 towards the Humber Bridge, goes directly across the runways of the former RAF Bomber Command airfield at RAF Elsham Wolds (where over 1000 of its
A15 road (England) to the Forest Pines golf club and hotel at Broughton. Ermine Street continues north as the B1207, meeting the Humber near Winteringham. The route of the A15 now becomes part of the three-laned M180, which was opened on 2 September 1977. The A15 section along Ermine Street was planned to be opened at the same time, but it had to wait twelve years. The buildup of traffic to Grimsby prompted calls for the Brigg bypass for many years, but the Flixborough explosion of 1974 made it more of an emergency. This section goes under the A18, over the River Ancholme,