Outside populated areas, intercity buses are allowed to travel at a maximum of 90 km/h on all roads, including 
Under the traffic rules, intercity buses and minibuses are allowed to travel at a maximum of 90 km/h on all roads outside populated areas (clause 69). This limit applies equally to motorways.
Option 1. This is the speed set for other types of buses on roads that are not motorways, not for intercity buses.
Option 2. The Rules do not set a maximum speed of 80 km/h for intercity buses on motorways.
Option 4. There is no general 100 km/h speed limit on motorways for any vehicle.
Option 5. The 110 km/h limit applies only to passenger cars and light trucks on motorways.