As someone who regularly gets stuck in traffic I know that we need to alleviate this horrendous bottleneck. The best and most ambitious idea is to extend I-91 south out of New Haven and across the sound into Long Island. The studies have been completed once before and they could be referenced and updated within a reasonable amout of time.
Coupled with this massive undertaking is studying the feasability of constructing the first hyperloop corridor from Boston - Washington D.C. With equally spaced stops in New Haven, New York, and Philidelphia. Imagine going from Boston to D.C. in a matter of minutes with tops speeds of 700 plus miles an hour. If it works out well it could possibly one day be extended all the way to Florida.