THE Hatfield Tunnel will be closed for maintenance overnight tonight.

Both the current northbound and southbound A1(M) carriageways between junctions three (Welham Green) and four (Hatfield) will be shut from 10pm until 5am tomorrow (Thursday).

A diversion along the A1001 will in place on both days.

Both carriageways are currently travelling through the southbound tunnel while a two-year refurbishment project takes place.