thedotwatchdog.com looks like a very handy web site for truckers who want to know were D.O.T. is. DOT (Department of Transportation) a.k.a. truck police, are the armed tax collectors who specifically harass tuckers, landscapers and basically any one who may drive in a "commercial looking truck". I avoid DOT when ever I can, because even if everything goes well it is going to be an hour or 2 with the truck inspection.