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
West Lindsey parish) it meets the River Witham and North Kesteven. It follows the River Witham westwards until Greetwell where it meets the City of Lincoln, deviates northwards, crossing the Lincoln - Market Rasen railway line. It follows the outskirts of Lincoln, crossing the B1182 (former A46) at Nettleham. It crosses the A15 north of the Riseholme roundabout, and follows a short section of the A57, then crosses it, near Bishop Bridge. A few hundred metres west it meets the Foss Dyke, which from there a mile north-west is the boundary with North Kesteven. At Saxilby with Ingleby it deviates westwards from