USDOT Number- Get your filing done by a professional and make sure its done correctly. The United States Department of Transportation will do a mandatory audit within 18 months from the time you apply for your authority so make sure you get it right before they arrive. We will inform you of everything that you will need to make sure you pass your audit. We know what it takes because we have owned our own trucking company and we have USDOT Certified personnel on staff at all times.