(a) Where street or highway construction work is being conducted, signs and other traffic control devices, as adopted in section one, article three, chapter seventeen-c of this code, shall be posted giving the location of the work and notifying all motorists as to the speed limit and any other traffic restrictions.
(b) Any person who exceeds any posted speed restriction or traffic restriction at a construction site referred to in subsection (a) of this section by less than fifteen miles per hour is guilty of a misdemeanor and, upon conviction thereof, shall be fined not more than $200.
(c) Any person who exceeds any posted speed restriction or traffic restriction at a construction site referred to in subsection (a) of this section by fifteen miles per hour or more is guilty of a misdemeanor and, upon conviction thereof, shall be fined not more than $200 or confined in a regional jail not more than twenty days, or both.
(d) Nothing in this section shall be construed to preclude prosecution of any operator of a motor vehicle who commits a violation of any other provision of this code for such violation.