(c) Unless an adjournment of the hearing date has been granted, upon the operator's failure to appear for a scheduled hearing, the commissioner shall suspend the license or permit to drive or non-resident operating privilege until the operator petitions the commissioner and a rescheduled hearing is conducted, provided, however, the commissioner shall restore such person's license or permit to drive or non-resident operating privilege if such rescheduled hearing is adjourned at the request of a person other than the operator. Requests for adjournments shall be made and determined in accordance with regulations promulgated by the commissioner. If such a request by the operator for an adjournment is granted, the commissioner shall notify the operator of the rescheduled hearing, which shall be scheduled for the next hearing date. If a second or subsequent request by the operator for an adjournment is granted, the operator's license or permit to drive or non-resident operating privilege may be suspended pending the hearing at the time such adjournment is granted; provided, however, that the records of the department or the evidence already admitted furnishes reasonable grounds to believe such suspension is necessary to prevent continuing violations or a substantial traffic safety hazard; and provided further, that such hearing shall be scheduled for the next hearing date. If a police officer does not appear for a hearing, the hearing officer shall have the authority to dismiss the charge. Any person may waive the right to a hearing under this subdivision, in a form and manner prescribed by the commissioner, and may enter an admission of guilt, in person or by mail, to the charge of operating a motor vehicle in violation of section eleven hundred ninety-two-a of this article. Such admission of guilt shall have the same force and effect as a finding of guilt entered following a hearing conducted pursuant to this subdivision.