In the Washington DC area of the US, it seems that everything to control traffic has been tried.  Signs of all type, traffic circles, speed tables, etc. to various affects on traffic, pedestrians, and businesses.  Now the new trend is traffic cameras, and un-marked cars.  However, it seems to me that the red queen effect is always the dominant stakeholder. (You have to run fast just to stay in the same place).  People are smart, crafty, and resistant to control.  Th