The real traffic bottleneck is at North Hills. A “solution” that is being used for this situation is to throttle the traffic going towards North Hills at the Millbrook intersection. This is why Millbrook Road has such extensive backup during rush hour.
Adding an extra lane north of North Hills will not fix the traffic problem at North Hills, and even increases the flow of traffic coming into North Hills from the north. The City has not given a satisfactory response or even a solution for this painfully obvious flaw.