WASHINGTON — Sen. Barbara Boxer, D-Calif., plans to explore the increased use of municipal bonds and private investments to improve the nation’s transportation systems, she said yesterday after raising concerns about a commission proposal to boost the federal gas tax.

“We are exploring all of the funding mechanisms that are out there, including private financing, infrastructure [tax-credit] bonds and municipal bonds,” Boxer, chairman of the Senate Environment and Public Works Committee, told reporters after a hearing on a recently unveiled report by the National Surface Transportation Policy and Revenue Study Commission.

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