It shall be unlawful for a driver of any school bus, whether a public or a contract bus, to drive said bus at a speed greater than forty-five (45) miles per hour while transporting children to and from school on regular routes. However, any such driver, while operating a school bus on other authorized trips, shall not drive said school bus at a speed greater than fifty (50) miles per hour. Any person who shall violate the provisions of this section shall be guilty of a misdemeanor and, upon conviction thereof, shall be fined not less than twenty-five dollars ($25.00) nor more than one hundred dollars ($100.00) for each such offense. In addition thereto, upon such conviction, such driver may be discharged from further employment as a school bus driver or carrier and his contract as such may be terminated.