The County Commissioners of St. Mary’s County may regulate bridges in the county that are not in a municipality and that have not been designated or maintained as a part of the State or federal highway system relating to: vehicle weight; vehicle parking; vehicle abandonment; building or maintenance by a private or public utility relating to the performance of the utility’s purpose; the building or maintenance of driveway connections where connections are provided; and vehicle speed. If required by an ordinance enacted under subsection (a) of this section, the County Commissioners of St. Mary’s County shall provide appropriate traffic control devices. For a new bridge, the County Commissioners of St. Mary’s County may regulate relating to: engineering; construction; and acceptance of the bridge into the county road system.