(a) A toll road must be all or part of a state highway or a major arterial road that connects two state highways, two federal highways, or a combination of state and federal highways.
(b) A district may not construct a toll structure within two miles of the intersection of the toll road and a federal highway unless the toll structure is located in a county with a population of more than 3.3 million or a county adjacent to a county with a population of more than 3.3 million.