WASHINGTON — The Senate narrowly approved a proposal to prohibit the use of private-activity bond financing on certain toll roads as they inched toward final passage of a two-year, $109 billion highway reauthorization bill Tuesday.

They voted 50 to 47 to approve an amendment offered by Sen. Jeff Bingaman, D-N.M., to the transportation bill sponsored by Sens. Barbara Boxer, D-Calif., and James Inhofe, R-Okla. Bingaman’s amendment would prevent the use of PAB financing for so-called brownfield concessions, which are dilapidated infrastructure systems, including existing toll roads leased by private companies for terms usually exceeding 75 years.

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