A17 in Sutterton A52 in Boston A158 near Partney The A16 road is a principal road of Lincolnshire in the East Midlands region of England, connecting the port of Grimsby and Peterborough, where it meets the A1175, A47 & A1139 then on to the A1 and the A605; the latter, in turn, giving a through route to Northampton and the west, and south west of England.

The road was "de-trunked", with responsibility largely returned to Lincolnshire County Council from the Highways Agency in 2002.

[citation needed] The 11-mile (18 km) £23 million Spalding-Sutterton Improvement (the Spalding Bypass) opened in August 1995.

It was narrow with many blind corners and slopes, and much of it was on an embankment with deep ditches either side and no run-off areas.

The road was a principal route servicing the food-processing industry in Spalding, bringing in supplies and moving products to the supermarket distribution system to the south.

[13] Eventually a route was agreed, avoiding Cowbit and Crowland and joining the A47 west of Eye, and in 2008 construction work began, originally due to be completed by Autumn 2010.