If you commute after the evening rush hour, there’s a chance you might need to switch up your route.

Through Saturday, the westbound I-285 entrance ramp to Ga. 400 in both directions will be closed nightly from 9 p.m. to 5 a.m., according to the Georgia Department of Transportation.

This is part of the nearly $800 million overhaul to one of metro Atlanta's most important interchanges.

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This is a map of the nighttime rerouting at I-285 and Ga. 400 through Saturday, Feb. 16, 2019.

Georgia Department of Transportation

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Georgia Department of Transportation

Previously reported as one of the biggest highway projects in Georgia history, it entails: "new I-285 interchanges at I-20 east and west of Atlanta, new Ga. 400 express lanes from I-285 to McGinnis Ferry Road and truck-only lanes on northbound I-75 from McDonough to I-475."

During the ongoing closures, GDOT says motorists on I-285 westbound should exit onto Roswell Road, where they'll be directed to enter I-285 eastbound. From there, motorists should take that I-285 eastbound exit to head north or south on Ga. 400.

Crews broke ground on the project in late 2016 and are expected to finish in 2020.

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