School buses shall be painted yellow with the words “School Bus” on the front and rear in letters at least eight inches high. All school buses shall be equipped with warning devices prescribed in § 46.2-1090. Only school buses as defined in § 46.2-100 may be painted yellow, identified by lettering as provided in this section, and equipped with the specified warning devices. A vehicle which merely transports pupils or residents at a school from one point to another without intermittent stops for the purpose of picking up or discharging pupils need not comply with the requirements of this section.