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HWY 21 Road Closures this Week
diverging diamond


New interchange configuration change requires State Route 21 closure

PORT WENTWORTH – The Georgia Department of Transportation anticipates contractors to complete the reconfiguration of the first diverging diamond interchange (DDI) outside of metro Atlanta on Sunday, Dec. 18. R. B. Barker Construction plans to close State Route (SR) 21 Friday night in preparation for the Sunday DDI changeover.During this period, SR 21 will be closed to thru-traffic under the Interstate 95 bridge. The Exit 109 ramps will be open to traffic with only right-hand turns on and off of SR 21. Traffic will be detoured beginning Friday night at 9 p.m.Detour routes will be signed as follows:
Motorists wanting to access SR 21 northbound at the interchange will travel northbound on I-95 to Exit 5 in South Carolina; reenter I-95 traveling southbound to Exit 109; turn right onto SR 21.Motorists wanting to access SR 21 southbound at the interchange will travel southbound on I-95 to Exit 106; reenter I-95 traveling northbound to Exit 109; turn right onto SR 21.Motorists are urged to seek alternate routes, if possible. Heavy congestion hinders the contactor from receiving needed materials in a timely manner.The $6.3 million redesign of the busy I-95 interchange at Exit 109 to a DDI configuration is expected to significantly improve safety and traffic flow. This DDI features interstate ramps with the only triple-left turn capability in Georgia.These unique designs cross traffic to the opposite side of the road across an interchange, so vehicles have unimpeded movement onto the freeway ramps. Left-turn movements, which are a typical challenge with standard four-way interchanges, are eliminated with a DDI.Outside of the revamped interchange design, construction added an auxiliary lane on northbound and southbound I-95 and reconfigured SR 21 from Hendley Road to SR 30.For more information on this and other active DDI projects, visit