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Charleston committee approves city’s first mini roundabout for James Island intersection
Summary
The Traffic and Transportation Committee approved installation of the city’s first mini roundabout at Old Military Road, Secessionville Road and the Grimble Road extension on James Island; SCDOT supports the plan, the approach speed limit will drop to 30 mph and the project will be funded from the city’s traffic-calming program.
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The Charleston City Committee on Traffic and Transportation voted July 14 to approve the city’s first mini roundabout at the intersection of Old Military Road, Secessionville Road and the Grimble Road extension on James Island.
Staff told the committee the mini roundabout is part of the city’s traffic-calming program and that the South Carolina Department of Transportation has reviewed and supports the concept. “They will actually be reducing the speed limit upon approach to the mini roundabout to 30 miles per hour,” staff said, explaining the approach speed change.
Staff described the geometry: the center median will be about 22 feet in diameter and designed to be traversable by fire apparatus. The committee was told the project will be funded from existing traffic calming funds rather than DOT capital; staff said funds will remain in the program after this project is funded and that the construction could occur within roughly the next six months.
Council member James Allen urged public outreach ahead of construction, promising door-to-door information and a public meeting for neighbors. “This is such a tricky intersection on James Island in the heart of District 12,” Allen said, adding that constituents had repeatedly raised concerns about safety there.
A motion to approve the project was moved and seconded; the committee approved the installation by voice vote.

