Correct answer: 4 : Outside a densely populated area - up to 60km/h - bus.
Outside a densely populated area, top speed <9 > - 50km/h: motorbike, towing trailer, other towing car;
- 60km/h: bus, trailers, special purpose cars, motorcycles;
- 70km/h: cars with more than 30 seats, trucks over 3,5 tons ;
Passenger cars with up to 30 seats (except for buses), trucks with a tonnage of less than 3500 kg.
Passenger cars with over 30 seats (except for buses), trucks with a tonnage of 3500 kg or more.
Cars towing trailers, other towing cars, motorcycles.