The State Board of Education may provide by regulation for the display of appropriate signs or other markings on school buses using alternative fuels. Such signs or markings shall conspicuously identify the vehicle as an alternatively fueled vehicle and indicate the type of alternative fuel used. No such sign or marking shall be more than 4 3/4 inches long or more than 3 1/4 inches high.
For the purposes of this section:
Signs and markings provided for under this section shall be in addition to other markings permitted or required by this title.
Va. Code § 46.2-1089.1