Off-road vehicles that are often used for working on farms and other similar jobs use Red diesel which is a form of Agri-Diesel. In almost all cases you cannot operate a vehicle on road with red diesel however if you have a tractor and using it solely for the purpose of working on a farm then you can travel on road with red diesel. However, there is also other forms of diesel that is part of the Agri Diesel Family such as Green and Clear Diesel.