DALLAS - Louisiana will have to tap into its transportation trust fund for the next 35 years to support debt service on bonds financing the state's $5.2 billion, 20-year-old highway improvement program.

Bonds for the program are supported with revenue generated from four cents of a 20 cents-per-gallon increase in the gasoline tax approved by voters in 1989. Revenue from the remaining 16 cents goes into the trust fund to pay for other highway construction and maintenance efforts. The total state gasoline tax is 38.4 cents per gallon.

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