Question: I work for an equipment dealership and we sell road oil distributors and cold mix patch boxes on heavy trucks, that are equipped with propane and diesel fired open flame burners, now I have been told from numerous people that having an open flame while moving down the road is illegal, and it totally makes sense, but I would like to know for sure and what rule pertains to it.  Can anyone advise as to where I can find this information?

    Answer: State law does say that open flame heaters are allowed on a vehicle when it’s used for heating the cargo of tank motor vehicles.   

    Information on this is under federal statute 49CFR 393.77.

    A portion of state statutes were used with permission from the Office of the Revisor of Statutes. If you have any questions concerning traffic related laws or issues in Minnesota, send your questions to Trp. Jesse Grabow – Minnesota State Patrol at 1000 Highway 10 West, Detroit Lakes, MN 56501-2205.  (You can follow him on Twitter @MSPPIO_NW or reach him at,