The Mississippi Transportation Commission, county boards of supervisors and/or the governing authorities of municipalities (hereinafter referred to as governmental entities), in their discretion, may construct, operate and maintain, individually or jointly with other governmental entities, one or more new toll roads or toll bridges in the state for motor vehicle traffic, including toll booths and related facilities, at those locations where an alternate untolled route exists. All such highways, pavement, bridges, drainage-related structures and other infrastructure comprising the projects shall be built and maintained in accordance with not less than the minimum highway design, construction and maintenance standards established by the contracting governmental entity for such highways, infrastructure and facilities.