(1) The competent authority may, by written notice, require the owner of a road vehicle used to transport a placard load to give to the competent authority—
(a) written evidence that the vehicle is covered by a policy of insurance or other form of indemnity mentioned in the Act, section 36 (1) (b) (Offence—vehicle not insured or approved—owner); or
(b) an approval under section 239 in relation to the vehicle.
(2) The competent authority may, by written notice, require a prime contractor responsible for the condition of a road vehicle used to transport a placard load, to give to the competent authority—
(a) written evidence that the vehicle is covered by a policy of insurance or other form of indemnity mentioned in the Act, section 37 (1) (b) (Offence—vehicle not insured or approved—prime contractor); or
(b) an approval under section 239 in relation to the vehicle.