There are 61,000 structurally deficient bridges in the United States, and this is what congressional Republicans want to do to transportation funding: The Center on Budget and Policy Priorities' Robert Greenstein has more: The House and Senate budgets cut highway and mass transit funding by an average of about 28 and 22 percent, respectively, over the next decade.[4] To be sure, gas tax revenues for the Highway Trust Fund have fallen as fuel efficiency has risen, leaving a shortfall in the financing of highways and mass transit.