Instead of displaying directions for the A611, from Hucknall to Nottingham, the sign reads the A511 - a road which normally runs from Foston in South Derbyshire to Markfield in Leicestershire.
Dispatch reader Alan Barker said: “An observant friend of mine, Mr Naylor of Hucknall, spotted that on the new Hucknall inner relief road, someone has put a wrong road number on one of the new signs.
“Thought I would tell you, we don’t want everyone ending up in Leicester?”
The new road was opened in November to ease traffic problems in Hucknall town centre, as part of a £12.9m regeneration project.
The A511 road is a 21-mile stretch of mainly single-carriageway road which runs northwest and links the towns of Coalville, Ashby-de-la-Zouch and Burton upon Trent.