I think there are a few reasons it stacks up in those general areas on Rte 3N. First issue is no one knows how to merge. Whether it's lack of skill or drivers feeling the need to prove a point, I can't tell you how many times I've been through Merrimack and saw how much easier traffic would flow if folks could either pay attention or cooperate a little better within the merge sections from 3 to 2 lanes.
Second issue in my mind is the section just after the tolls in Merrimack. That righthand exit getting onto 293 should have been its own exit lane. Instead, everyone stacks up leaving the tolls due to 5 lanes of traffic all merging (3 from the tolls and 2 from the onramp next to the tolls) while the right lane ends up being a travel lane at the same time drivers are slowing for the exit to 293.
Something can be done to smooth many areas out however I'm not exactly confident in what the outcome will be. I agree completely...whomever is in the planning room is not thinking long term.
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