It depended upon whether the road was city, county, state or federal. Trouble is we mix all these different roads in one system. And light timing is done for roads that cross each other, so there may be four different traffic flows being engineered. And two may be city and the other two county or state. I don�t know to what degree they even try to coordinate, but even if they do, there are engineering philosophies involved that may not mesh totally.
I think all the engineers have figured this out and are now working together in their efforts to reach gridlock ;-)Dan Prozinski
Cedar Riverside
