Much of the rush hour traffic on the Northway is from commuters who are trying to get between Saratoga County and Albany or I-90. The various ramps for Exits 2-7, and the subsequent merging that needs to take place, only slows everyone down.
I imagine it would easy congestion if the Northway had a fourth lane in each direction.
It would be especially helpful if this was an "express" lane (or HOV lane) separated from the rest of the Northway along this stretch to avoid lane-changing and merging. Long-distance commuters shouldn't have to get tangled up with the Latham and Colonie traffic.