Do you drive, garydubrail?  
 
Otherwise by looking at the street map of Salt Lake City and Oahu you will know that there are over a hundred street intersections.  And most of these intersections have a Green Arrow at the center.

And unless you drive a motorcycle, truck or car,  you won't have any idea at all what I am talking about concerning "GREEN ARROW" AT THE CENTER OF AN INTERSECTION -  AND  "ALL CARS MOVE FORWARD INCLUDING THOSE MAKING A LEFT TURN" at an intersection in Utah.

The Green Arrow at the center of an intersection wastes precious minutes of travel time. At 2 minutes in delay wasted at each intersection means over 10 minutes of travel time wasted in 5 intersections.  The Utah innovation saves a commuter 10 minutes in travel time going thru  5 intersections.