If you are a resident of Roswell, Alpharetta, or even Johns Creek, there is a phrase that you are absolutely petrified to see when driving anywhere in Roswell: Holcomb Bridge Road.
Why is that? It's because the traffic and congestion on this road is by far the worst in nearly all of North Fulton. Among the many, many reasons for this congestion (i.e. WAY too many lights...), the worst of them has to be the complete lack of coordination between the stop lights. We are all forced to drive light-to-light catching every single red light along the way. The worst part of it has to be when we look ahead down the road and see large sections of the road completely empty because we're all back, stuck at a red light.
When I say "coordination between the stop lights", I am referring to the concept that is, for some reason, foreign to the city planners of Roswell, Alpharetta, or any other town in the Greater Atlanta area (including Atlanta). The idea is that the lights are timed so that once the first light turns green, the next stop light will turn green 10-15 seconds later, and then next light will turn green 10-15 seconds after that, etc.
Cities like New York, Chicago, Boston, and even Los Angeles (WHAT?!) have coordination of stop lights to help traffic moving more smoothly during peak rush hour times.
Now, I do understand that people will say "Holcomb Bridge is two directions... how do you do that on a 2-direction road?" The solution is: coordinate in the direction of rush hour traffic. For Holcolm Bridge, coordination should happen in the direction of 400 in the morning and away from 400 in the afternoon and evening.
Lastly, and this is just perfect, the AJC had an article from March 2011 ("Turning Georgia's Traffic Signals Green") stating that the DOT was beginning an initiative to start coordinating lights throughout Metro-Atlanta and even named Holcomb Bridge Road specifically as one of the major arteries needing repair... Well, needless to say, I think there has been absolutely no action in those 2 years and things are just getting worse with the continual population growth in North Fulton County.
So, until Roswell or Alpharetta, figure out the most basic of road planning concepts (that even LOS ANGELES figured out), I'll continue to avoid Holcomb Bridge Road like the plague... And I hope, for your sanity, that most of you do as well.