Threekingham Bar is the name given to interception of the A52 (Grantham to Boston) and A15 (Peterborough to Lincoln and Hull) roads to the west of the village of Threekingham, in Lincolnshire, England[2]
The interception is arranged as a small modern roundabout. Both roads are single carriageway. The countryside is gently undulating, and the A52 descends into an attractive valley to the west. The location is entirely rural, with no human habitations.
The name dates it to the turnpike era. The A52 follows somewhat the route of the Salters Way.
An 18th century mile post is in the verge 200m south of the modern roundabout.