Threekingham Bar is the name given to interception of the A52 (Grantham

Grantham

Grantham is a market town within the South Kesteven district of Lincolnshire, England. It bestrides the East Coast Main Line railway , the historic A1 main north-south road, and the River Witham. Grantham is located approximately south of the city of Lincoln, and approximately east of Nottingham...

 to Boston

Boston, Lincolnshire

Boston is a town and small port in Lincolnshire, on the east coast of England. It is the largest town of the wider Borough of Boston local government district and had a total population of 55,750 at the 2001 census...

) and A15 (Peterborough

Peterborough

Peterborough is a cathedral city and unitary authority area in the East of England, with an estimated population of in June 2007. For ceremonial purposes it is in the county of Cambridgeshire. Situated north of London, the city stands on the River Nene which flows into the North Sea...

 to Lincoln

Lincoln, Lincolnshire

Lincoln is a cathedral city and county town of Lincolnshire, England.The non-metropolitan district of Lincoln has a population of 85,595; the 2001 census gave the entire area of Lincoln a population of 120,779....

 and Hull) roads to the west of the village of Threekingham

Threekingham

Threekingham is a village in mid-Lincolnshire, on the A52 Grantham to Boston road, near Sleaford, close to the A15 Threekingham Bar roundabout. Mareham Lane, the Roman Road aligned with King Street, crosses the A15 at Threekingham....

, in Lincolnshire

Lincolnshire

Lincolnshire is a county in the east of England. It borders Norfolk to the south east, Cambridgeshire to the south, Rutland to the south west, Leicestershire and Nottinghamshire to the west, South Yorkshire to the north west, and the East Riding of Yorkshire to the north. It also borders...

, England

England

England is a country that is part of the United Kingdom. It shares land borders with Scotland to the north and Wales to the west; the Irish Sea is to the north west, the Celtic Sea to the south west, with the North Sea to the east and the English Channel to the south separating it from continental...

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.