The County Commissioners of Carroll County may regulate the public 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 necessary for the performance of the utility’s purpose; and vehicle speed, but only if the speed regulation has been recommended by the Department of State Police. To indicate and carry out rules and regulations adopted under subsection (a)(1), (2), and (5) of this section, the County Commissioners of Carroll County shall provide appropriate traffic control devices that conform to State specifications. For a new bridge, the County Commissioners of Carroll County may adopt rules and regulations relating to: engineering; construction; and acceptance of the bridge into the county road system for maintenance by the county. By local law, the County Commissioners of Carroll County may establish that a person who violates a rule or regulation adopted under this section is guilty of a misdemeanor and on conviction is subject to a fine not exceeding $25, exclusive of costs. A penalty provision of another public general law prevails over a fine authorized under this subsection.