Northbound I-75 between Schaefer Highway and Rosa Parks Boulevard will close starting Friday at 8 p.m. ending Saturday at 4 p.m.
The closure will be for the weekend demolition of three pedestrian bridge structures over I-75 between Springwells Street and Waterman Street.
MDOT officials say the extended closure length is due to ongoing construction already in place.
The closed on-ramps include those at Schaefer Highway, Springwells Street, Waterman Street, Livernois Avenue, Clark Avenue, West Grand Boulevard and Vernor Highway.
The ramp to the Ambassador Bridge can be accessed via West Grand Boulevard and Fort Street.
Motorists can take a detour via northbound I-75 to westbound Schaefer Highway to eastbound I-94 to eastbound I-96 to northbound I-75. Local traffic can use northbound Fort Street and enter northbound I-75 at Rosa Parks Boulevard.
The construction is part of the 75Rouge: Detroit-Downriver Connection project, a $220 million bridge project that involves removing and replacing concrete on the Rouge River Bridge.
Drivers are advised that there are local county projects affecting the intersection of Dix-Toledo, Allen and Pennsylvania roads near the Dix-Toledo Road ramp leading to southbound I-75.
Heavy traffic and long delays should be expected, and drivers are strongly advised to use Fort Street as a detour route.