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It is one of the major questions facing the state gambling commission: Which infamous Boston bottleneck will get the bulk of new casino traffic?
Should it be Route 1A in East Boston? The often jammed-up commuter highway, and a key local road for East Boston, Revere, and Winthrop?
Or should it be Sullivan Square in Charlestown, where residents have waited decades for a traffic fix?
For all the differences between rival casino proposals by Mohegan Sun in Revere and Wynn Resorts in Everett, both have raised concerns from transportation experts that they could make the region’s famously bad traffic even worse.