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
Branston and Mere Witham is called Branston Island, meeting Fiskerton, Stainfield and Bardney, passing Bardney Lock. It meets Potter Hanworth at Bardney Bridge and follows Branston Causeway (becomes the B1190) westwards, skirting the north edge of Potterhanworth Booths. It follows the B1202 westwards for around a half mile, then skirts the southern edge of a wood, crosses the railway line and Little Gate Lane, then Sleaford Road (B1188). It meets Nocton west of Fox Covert, and crosses Bloxholm Lane at the point where Branston Lane crosses, and meets Waddington halfway between Bloxholm Lane and the A15. Mere Hall is around a mile to