GA 400 South & North, between Holcombe Brideg exit 7 and the river.
Roswell police motorbike Speedcops sit on the Emergency lanes both North and South, with their radar guns resting on their left fore-arms, picking people off "like shooting fish in a barrel" on this fast run down to, or up from the river. Many drivers never see the low visual profile bike cops until too late – they are never there in rush-hour, as the traffic rarely gets near speed-limit. Tip if you see anything in the Emergency lane half a mile away, just don’t be the fastest car on 400 near Holcomb Bridge !! Good luck.