READ | Super speeders part of commuting on Ga. 400, 'the Alpharetta Autobahn'
READ | I-285/Ga. 400 project causing Fulton lane closures through weekend
Crews will add a third left-turn lane at Windward Parkway that will extend westbound along Windward to Deerfield and Westside parkways.
Tawil said there would be sporadic road closures required to finish the project.
In December 2011, crews added a dedicated right-turn lane to the northbound Ga. 400 off-ramp.
"Prior to this improvement, northbound congestion at the Windward Parkway and GA-400 interchange was notorious with more than 168,000 cars passing through the interchange each day," the CID said on its website.
For years, residents have said in surveys that they want some more mass transit connectivity to the Windward/Ga. 400 area, either through rapid buses or a rail extension.
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Gwinnett County's referendum to expand MARTA has failed. Approximately 91,000 votes were counted with 100% of precincts reporting. Gwinnett has twice rejected MARTA before, in 1971 and 1990.