The B1515 in Lincolnshire follows the original route of the A151 through the Lincolnshire town of Holbeach (the section east of the B1168 was numbered A17 until the 1940s).
The road starts at a roundabout on the A151 on the western side of Holbeach and heads eastwards through the town before continuing to Fleet Hargate, where it ends on the present route of the A17.