It was built in 1928 for cars and vehicles of that era. Not sure if height was an issue, but the road width was the problem. Bikes and pedestrian traffic was kind of scary as well. When the new bridge was built, the end away from the village was moved a few feet over to where Swansons is now, to straighten the road out a bit. Used to be when you came off the bridge you would have to take a sharper right than you do now. Trucks coming from Cambridge would cut that "corner" a bit, and I do remember a couple of cars going through the bridge getting parked in the guardrail to avoid a head-on.
I think it was moved over 8-10 feet. That's why we lost the old museum because it was going to be in the way of all the preparations.