IF the petrol or derv is carried in tanks with a capacity of 1000litres or more thenit comes under the ADR-HAZERDOUS regulations. IF how ever the
amount is carried in 20litre jerrycans and is less than 1000itres it is not under those regulations.BUT you will have to carry it securely and safely
as per the HSE regulations for the UK,these will state what the person who is carrying those articles mustcomplie within the way of the above mentioned remarks,The same rules apply to those who carry gas cylinders