Ramp Meter Early Study Results
Jan 20, 2010
Since June 2008, GDOT has activated 148 ramp meters on 14 corridors in the Atlanta region. The following table provides early study results for 10 of these newly-metered corridors.
GDOT engineers have been measuring the BEFORE and AFTER conditions on the freeways where the meters have been activated. Meters are designed to smooth out the flow of freeway traffic, allowing higher travel speeds with less congestion. So far, the meters have been doing just that.
Below are some of the early results. For more information on ramp meters, click here.
| Corridor | Avg Trip Time BEFORE | Avg Trip Time AFTER | % savings |
| I-85 N from I-285 to SR316 (PM) | 28 mins |
17 mins |
39% |
| I-85 S from SR 316 to I-285 (AM) | 21 mins |
16 mins |
24% |
| I-285 N from US78 to I-85 (AM) | 9 mins |
6 mins |
33% |
| I-285 S from I-85 to US78 (PM) | 15 mins |
11 mins |
26% |
| 75/85 N from Langford to I-20 (AM) | 10 mins |
6.5 mins |
35% |
| I-75 N from I-285 to Wade Green (PM) | 26.5 mins |
20 mins |
24% |
| I-75 S from Wade Green to I-285 (AM) | 26 mins |
21 mins |
19% |
| I-285 N from I-20 to US 78 (AM) | 14.5 mins |
11 mins |
24% |
| I-285 W from GA400 to I-75 (PM) | 13.5 mins |
11.5 mins |
14% |
| I-285 W from I-85 to GA400 (AM) | 10.5 mins |
8.5 mins |
19% |