I think a problem is too many exits and on-ramps within a relatively short distance on all of the major stretches of road. Each of.these is a point where there is a high probability of lane changing and cause of a slow down when people try to avoid the oncoming traffic from one on-ramp and then change back to get to their exit. It's convenient when it isn't rush hour, but each of those points just compounds the congestion problems.
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