CHICAGO — With its seven-year-old $6 billion capital program nearing completion, the Illinois State Toll Highway Authority on Thursday unveiled a follow-up $12 billion, 15-year plan that relies on a toll increase to help repay an estimated $4.8 billion of new borrowing.

The proposal funds construction of new toll roads and projects aimed at keeping 286 miles of roadways that make up the 52-year-old system in a state of good repair through 2026.

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