Category D1   -   Minibus Driver Training  -   Age 21 We use a Mercedes Sprinter 4.1 ton 16 seat minibus for Category D1 Minibus driver training. This category of licence is required to drive a vehicle with between 9-16 passengers for hire or reward. The rules relating to this category can be quite complex: click here for a fuller explanation - be prepared! The price you see is the price you pay - Guaranteed! No hidden charges - all-inclusive prices.