Upon the director's issuance of a permit, the permittee shall furnish to the director
a list of the vehicles that he proposes to operate, describing them in such detail
as the director may require. The permittee shall furnish to the director similar descriptions
and details when he proposes to place any additional vehicle in operation or withdraw
from operation any vehicle theretofore operated. The director shall determine the
number of vehicles a permittee shall be authorized to operate at any one time. The
director shall devise a system of identification for authorized vehicles and prescribe
and issue a certification decal identifying each vehicle as one lawfully operated
under the permit.