If you carry commercial pesticides in a vehicle, they have to be in a locked, leak-proof container, because of contamination to water courses if you had an accident etc. The Health & safety, and the Environment Agency are not stupid, if they see you spraying a drive etc, they will want to see your paperwork....Just book into your local Agricultural college and get trained its a lot easier. I know the In's and out about this subject as i used to do allot of spraying for the environment agency, on water courses, reservoirs etc, footpath spraying for councils.