The department shall identify and include in the work program projects to increase capacity by widening existing two-lane arterial rural roads to four lanes. To be included in a work program project, the road must be classified as an arterial rural road, and truck traffic using the road must amount to at least 15 percent of all such traffic, as determined by the department. The department shall fund at least $20 million annually for such projects.
Fla. Stat. § 339.68