The Federal Motor Carrier Safety Administration (FMCSA) of the United States Department of Transportation (USDOT) is issuing this notification to advise the motor carrier industry of the discontinued use of the fields on FMCSA registration forms that refer to Division 2.2 anhydrous ammonia, Class 3A and Class 3B.  These entries are no longer relevant due to the Federal Hazardous Materials Regulations (HMR) and FMCSA’s deletion of domestic transportation of anhydrous ammonia from the list of hazardous materials subject to the Hazardous Materials Safety Permit (HMSP).