When the state road commissioner has reason to believe that an approved device as being sold commercially does not comply with the requirements of this chapter, he may, after giving thirty days' previous notice to the person holding the certificate of approval for such device in this state, conduct a hearing upon the question of compliance of said approved device. After said hearing the state road commissioner shall determine whether said approved device meets the requirements of this chapter. If said device does not meet the requirements of this chapter he shall give notice to the person holding the certificate of approval for such device in this state.

If at the expiration of ninety days after such notice the person holding the certificate of approval for such device has failed to satisfy the state road commissioner that said approved device as thereafter to be sold meets the requirements of this chapter, the state road commissioner shall suspend or revoke the approval issued therefor until or unless such device is resubmitted to and retested by an authorized testing agency and is found to meet the requirements of this chapter, and may require that all said devices sold since the notification following the hearing be replaced with devices that do comply with the requirements of this chapter. The state road commissioner may at the time of the retest purchase in the open market and submit to the testing agency one or more sets of such approved devices, and if such device upon such retest fails to meet the requirements of this chapter, the state road commissioner may refuse to renew the certificate of approval of such device.