WASHINGTON — Backers of alternatives to traditional highway financing are ramping up efforts to win over policy makers and a skeptical public, as the groundswell against tolling remains strong and lawmakers labor to save the rapidly diminishing Highway Trust Fund.

Though Sen. Barbara Boxer, D-Calif., said Thursday she is optimistic about the approval of revenue provisions under discussion for a new multi-year highway funding bill, most experts agree that the gas tax-based highway fund, long a reliable source of funding and method of securing bonds, is no longer adequate to fund the nation’s road network.

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