6. Powers to stop and detain vehicle.

(a) that the toll has not been paid, he may detain the motor transport vehicle or any part or accessory thereof, which is considered sufficient in his opinion for realisation of the toll, until the toll is paid, or.
(b) that any breach of the provisions of this Act has been committed, detain the motor transport vehicle or any part or accessory thereof, which is considered sufficient in his opinion for realisation of the maximum amount of penalty leviable under Section 7, until the penalty is paid or security equivalent to such amount is furnished: