The M1 motorway will be closed for two nights as Highways England urgently investigate what they describe as a potential concern.
Routine maintenance highlighted the issues with the gantries over the motorway and the work has been planned at short notice as a safety precaution.
The section affected stretches from junction 13 at Milton Keynes to junction 11 at Luton. The work will take place between 10 pm and 5 am with the southbound route affected on October 12 and the northbound route on October 13. Diversions will be in place during the closures.
During the work older, out-of-use speed cameras will be inspected and removed from overhead gantries.