CHICAGO — The Illinois State Toll Highway Authority board Thursday approved a $12 billion, 15-year capital program that relies on a steep increase in passenger tolls to repay $4.8 billion in borrowing and raise cash to maintain and expand its existing 286-mile system.

The 7-1 vote in favor of the program came one day after Gov. Pat Quinn offered positive comments about the plan crafted under the leadership of his hand-picked executive director and after the board rejected an alternative proposal from board member Bill Morris for a lower rate increase. Morris, a retired public finance banker, was the sole member to vote against the capital plan and toll hike.

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