(a) As used in this section, “local highway” means a highway that is under the control of a town, city or borough; and “local traffic authority” means the traffic authority of a town, city or borough.

(b) (1) At the request of the legislative body of a town, city or borough, the Office of the State Traffic Administration may designate as a school zone any part of a state highway that is adjacent to school property or is, in the opinion of said office, sufficiently close to school property as to constitute a risk to the public safety under all the circumstances. At the request of such legislative body, the commission may revoke any such designation. (2) A local traffic authority may designate as a school zone, and may revoke any such designation, any part of a local highway that is adjacent to school property or is, in the opinion of the local traffic authority, sufficiently close to school property as to constitute a risk to the public safety under all the circumstances.

(c) The Superior Court shall impose an additional fee equivalent to one hundred per cent of the fine established or imposed for the violation of the provisions of § 14-218a or 14-219, for any such violation committed in a school zone designated in a conspicuous manner by the Office of the State Traffic Administration or local traffic authority.

(d) The Office of the State Traffic Administration with regard to a state highway or the local traffic authority with regard to a local highway shall cause to be posted a sign approved by the Office of the State Traffic Administration (1) at the beginning of a school zone in each direction that traffic is permitted to flow which shall read as follows: “SCHOOL ZONE AHEAD FINES DOUBLED”, and (2) at the end of such zone in each direction that traffic is permitted to flow which shall read as follows: “END SCHOOL ZONE”.