How about a basic "understanding" how traffic actually moves the rythym and patteren
Today aint no Cops out there they Busy "On-Call" already ..
Another factor ya must consider as well
Roughly half the people out there today playing with the cell phone aint exactly watching traffic or paying attention.
Government Policy "Traffic Designers" at DOT who never ran down a "Highway" their entire life comes up with "Traffic Calming"