"Section 513(g) directs the Department of Transportation in consultation with the Department of the Treasury to study: (1) alternatives to the heavy vehicle use tax and (2) plans for improving the collection and enforcement of the tax and its alternatives. The Section further stipulates that alternative taxes include those based either singly or in combination on : (1) vehicle size or configuration, (2) vehicle weight, both registered and actual operating weight, and (3) distance traveled." Intro.