At first I thought that those digital "slow down" signs were stupid, but now I believe that they might actually have an effect. It's sort of nice to be thanked for doing something once in a while, even if it is by a sign!
I also love those digital speed limit signs! We should have more of them in Melrose! They work for me and remind me that I may be speeding. I live off Upham Street and I can tell you they are working perfectly - see considerably less speeding!