On one of the busiest trucking routes in the United States, with more than $1 billion in freight passing across it every day, the gridlock serves as a constant reminder of unfulfilled promises in the nation’s long-running infrastructure debate.”It’s been batted around by both parties for a long time, but the need is now,” said Brad Slabaugh, general manager of Hilltop Companies, a construction firm that sits in the shadow of the bridge. “We had promises from past administrations and we would like to see those promises come through.”As a new debate begins over President Joe Biden’s ambitious infrastructure proposal,