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SR 324 at I-85 Interchange
Gwinnett County Department of Transportation Project, F-0782-01, PI No. 0012698 proposes four new ramps to create a new location, full access diamond interchange with the existing overpass of (non-controlled access) SR 324 / Gravel Springs Road over (controlled access) I-85 / SR 403. The interchange will be situated between the existing SR 20 / Buford Drive and Hamilton Mill Road interchanges at milepost 118 within Gwinnett County. No new bridge or bridge widening is proposed by this project.

The southbound entrance ramp (Ramp A) will have two through lanes that converge to a single through lane prior to merging onto I-85 / SR403. The southbound exit and northbound entrance ramps (Ramps B and C, respectively) will each have a single through lane. The northbound exit ramp (Ramp D) will have two through lanes diverging from I-85 / SR 403. One of these lanes will be received from an auxiliary lane constructed by GDOT PI No. 110600 prior to this project.

The intersection of SR 324 / Gravel Springs Road with the southbound ramp terminals will consist of dual left turn lanes onto both I-85 / SR 403 SB and SR 324 / Gravel Springs Road EB. Dedicated right turn lanes will be provided onto SR 324 / Gravel Springs Road WB and I-85 / SR 403 SB. The intersection of SR 324 / Gravel Springs Road with the northbound ramp terminals will consist of dual left turn lanes onto SR 324 / Gravel Springs Road WB. A single turn lane will accommodate the I-85 / SR 403 NB movements. A dedicated right turn lane will be provided onto SR 324 / Gravel Springs Road EB and I-85 / SR 403 NB. Traffic signals would be placed at both of these intersections.

The project limits along I-85 / SR 403 are 3.14 miles long and dictated by the length of proposed ramps tapering into the through general purpose lanes and the advance signage for the interchange on both the general purpose lanes and the ‘HOT’ managed lanes proposed by PI #110600. The project limits along SR 324 / Gravel Springs Road are 0.45 miles long and set where the turn lanes for the ramp terminals tie back into the through lanes near the intersections with Morgan Road and Camp Branch Road.

A Public Hearing Open House meeting on project numbers F-0782, PI No. 0012698 for the new interchange at SR 324 / Gravel Springs Road and I-85 was held on December 15, 2016.

Project Display (Click to file)

Meeting Handout (Click to file)

Comment Sheet (Click to file)

Should you have any questions or need additional information on this project, please contact Gwinnett County Department of Transportation at 770.822.7400.