BRUNSWICK — Traffic headed north on Route 1 will be detoured on Oct. 24 and speed limits will be lowered for about two weeks after that while crews make repairs to a railroad overpass.

An overheight vehicle hit the Black Bridge, which carries Route 1 traffic over the rail tracks, necessitating the repairs, officials with the Maine Department of Transportation said. Work crews will install concrete Jersey barriers on Monday, Oct. 24, and will need to shut off northbound traffic.

A detour will take vehicles onto Pleasant and Maine streets and then back onto Route 1, MDOT officials said. The barrier work will begin at 9 a.m. and it’s expected to be done before the evening commute on Oct. 24. Once the barriers are in place, two lanes – one northbound and one southbound – will be opened.

Because of the work and the narrowness of the two lanes, the speed limit will be cut to 25 mph while repairs are being made. Message signs on I-295 northbound and Route 1 southbound will alert drivers to the work.