The Pipeline and Hazardous Materials Safety Administration has the primary responsibility for the issuance of DOT special permits and approvals to the Hazardous Materials Regulations (HMR). A special permit or approval is a document which authorizes a person to perform a function that is not currently authorized under the authority of the HMR. Also, in many instances, the Regulations require approvals and/or registrations prior to transportation in commerce. Further information regarding the functions of the office and the similarities and differences between special permits and approvals are set forth below.

If you have any questions regarding the information contained below contact the Office of Hazardous Materials Approvals and Permits either by telephone 202-366-4535 or by email form.