President Joe Biden’s $2.3 trillion infrastructure plan — the largest in American history — is designed to fix the nation’s crumbling roads, bridges and railroads while kick-starting the economy at a time when many Americans are still out of work. “Constructed in the 1950s, the stretch of I-95 between Greenwich and New Haven experiences some of the most significant traffic delays throughout the state,’’ the DOT says. “With the recent completion of a data-driven and strategic study, the department will improve portions of the interstate by focusing on targeted projects that modernize the expressway and improve congestion for travelers. The projects realized by this funding will focus on ‘hot spot’ congestion and safety improvements, rather than linear capacity improvements.” Biden is calling for increasing corporate taxes, which were sliced sharply under President Donald Trump. The rate was reduced from 35% to 21%, but Biden wants to boost the rate back up to 28%. Several multiyear projects include the $240 million reconstruction of I-91 and the Charter Oak Bridge in Hartford, installing rail improvements in Norwalk for $250 million and replacing the Rochambeau Bridge on I-84 at the Newtown border for $53 million.