As Sal Spinetti made his way to Massachusetts General Hospital shortly after 8 a.m. Monday morning, Charles Circle was a cacophony of car horns. As he had on many other mornings, Spinetti had encountered traffic on his trip across the Charles River from Cambridge.
But Monday’s traffic was different. It was the first workday commute after the partial closure of the Longfellow Bridge . For the next three years, no cars will be allowed to cross it from Boston to Cambridge, and for now, vehicles coming into Boston are using the opposite side of the bridge, a change that seems destined to create traffic nightmares for many commuters.