Section 25166 Of Article 6. Transportation From California Health And Safety Code >> Division 20. >> Chapter 6.5. >> Article 6.

. (a) A person who is registered as a hazardous waste transporter may voluntarily surrender a registration by submitting a letter signed and dated by the registered hazardous waste transporter indicating that the transporter no longer wishes to transport hazardous waste.
  (b) A person whose registration has expired for a period of more than 90 days shall be considered an applicant for an original registration when the person applies for registration.