When it comes to traffic congestion relief, this island of Oahu has not yet been exposed to what cities in the mainland have experienced in this the 21st century to improve traffic flow.  Volume of traffic to and from Honolulu pares in comparison to that in Meadowlands, New Jersey where 400,000 vehicles enter and exit the area.  Except that where before nightmares of traffic jams was a daily occurrence, traffic flow today is smooth and even faster than before.  The extremely complex causes of traffic jams in that region was easily resolved and solved by installation of a hi tech system involving traffic lights in the entire area,
And in some states such as in Utah, travel time is increased just by remodeling and redesigning existing intersections with left turn green arrow lights to a new and innovative design that allows vehicles to make a left turn simultaneously with the rest moving forward.