Anyone who doesn't believe these were installed as revenue generators, is living in a fantasy world. The speed cameras were installed and the speed limits were then set at unreasonably low limits. A couple of years ago now, I wound my way through DC in moderate traffic and ended up with a $100 ticket. The photo of my vehicle showed others directly in front of and behind me, so I'm guessing the camera had a field day, nailing everyone in sight.
I wrote in and told them to stuff it. After several threatening letters, the harassment stopped. I have yet to see anything on my credit report and have done RMV transactions as recently as two weeks ago with no issues.