(d) If repairs to an impounded motor vehicle are desired by the owner, he, with the permission of the commissioner, may authorize the motor vehicle to be taken to such repair shop or garage as he may select for the purpose of having it repaired at the owner's expense. Upon completion of such repairs, the motor vehicle shall be impounded as provided in subdivision (a).
Where the commissioner is satisfied by such evidence as he deems sufficient, that any motor vehicle is so damaged that it cannot be restored to operable condition, he may, in his discretion, upon such conditions as he deems proper, consent to the release of said motor vehicle from impoundment.