May an agricultural tractor registered for farm use be used for winter road maintenance (snow clearing and gritting) under municipal contract?

1. No, a tractor fitted with a municipal snow plough must first be re-registered as a Sonderkraftfahrzeug
2. No, winter maintenance under municipal contract is commercial haulage and needs a Category C licence
3. Yes, agricultural tractors fitted with approved snow ploughs and gritting spreaders may carry out winter maintenance, subject to the equipment, marking and tax rules
4. Yes, but only on roads inside the boundaries of the tractor owner's own municipality