The Cobb County Department of Transportation (CCDOT) will close the Interstate 75/Windy Hill Road overpass for two weekends while crews complete the new diverging diamond interchange (DDI) crossover.
The bridge will be closed to motorists and pedestrians the weekends of Feb. 18-19 and March 4-5, weather permitting. Ramp access will remain open, allowing motorists right turn access only onto Windy Hill Road. Detour information will be prominently placed throughout the area.
Beginning at 9 p.m., Friday, Feb. 17, crews will reconfigure the interchange and open the bridge by 5 a.m., Monday, Feb. 20, with the new interchange configuration open to traffic.
Beginning at 9 p.m., Friday, March 3, crews will pave and stripe the new interchange, opening the bridge by 5 a.m., Monday, March 6.
The DDI will permanently shift traffic to the opposite side of the bridge on both sides. At first, motorists will feel like they are driving on the wrong side of the road.
“It’ll take a minute for drivers to get used to the change. The DDI eliminates the need for a left turn signal onto Interstate 75,” said Jim Wilgus, CCDOT director. “Eliminating the signal will make through traffic and left turns onto I-75 safer and more efficient.”
A surge in population and business development since the 1980s has caused a steady increase in traffic along the Windy Hill corridor. A 2010 Summary of Crash and Injury Data & Comparison to Statewide Rates Report detailed crash rates along the stretch to be three times greater than statewide crash rates. Injury rates were double statewide rates. The report also showed crash and injury rates would remain high unless corrective safety measures were taken. Closing the bridge for reconfiguration and pavement marking is one of the final steps toward construction completion.
“We ask motorists coming to the Windy Hill Road area on those weekends to use extra caution and patience,” Wilgus said. “These final steps are necessary to bring valuable mobility improvements for businesses and motorists.”
The $20 million project is funded by SPLOST 2011, the Cumberland Community Improvement District, Georgia Department of Transportation, Federal Highway Administration, and State Road and Tollway Authority. Additional improvements along Windy Hill Road continue and will be completed in March.