Once again, as of January 1, 2019, intrastate motor carriers in Massachusetts will be required to obtain and display a United States Department of Transportation (USDOT) number per 540 CMR 2.22, the Commercial Marking section of the Registry of Motor Vehicles (RMV) regulations.
Below is the current online MADOT site to apply for your vehicle stickers:
https://portal.fmcsa.dot.gov/UrsRegistrationWizard/
Having trouble with the website? Below is the written application in PDF form: