BALTIMORE (WJZ) — Drivers, expect delays this weekend if you’re traveling through the northbound part of the Baltimore Harbor Tunnel.

Two-way traffic will run in the southbound bore, while the northbound bore will be closed from Thursday at 8:30 p.m. to 4:30 a.m. Monday, February 3.

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Crews will be pouring concrete and making manhole adjustments during the closure, all a part of the  Maryland Department of Transportation Authority’s three-year, $189 million I-895 bridge project to replace the 60-year-old bridge and Holabird Avenue exit ramp north of the Harbor Tunnel and to rehabilitate the tunnel.

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The project is in the back-end of its timeline, beginning in April 2018 and set to end in summer 2021.

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Drivers are asked to obey the speed limits and stay in their lanes, MDTA said, and to use I-695/Key Bridge or I-95/Fort McHenry Tunnel as alternate routes.