A complainant seeking to appeal the adoption of a regulation, within the meaning of State Government Article, §10-101(e), Annotated Code of Maryland, by the Secretary of Transportation or by any administration or agency within the Department, shall first file a complaint in writing to the chief executive officer of the administration or other agency which has promulgated the regulation, within 30 days after the complainant knows, or with the exercise of ordinary diligence should have known, that the complainant is aggrieved. Unless an extension of time has been agreed upon by the parties, the chief executive officer of the administration or agency shall render a decision within 30 days of the filing of the complaint. A copy of the decision shall be sent to the complainant by certified mail, return receipt requested.