The speed limit for a T100 bus on autowegen and motorways is 100 kilometers per hour. The name T100 actually says this.
If a bus is not a T100 bus, it is subject to a speed limit of 80 kilometers per hour on autowegen and motorways.
A T100 bus has no standing places and requires seat belts on all seats.
Article 1 of the RVV:
T100 bus: bus in respect of which an endorsement on the vehicle registration certificate or the vehicle registration register shows that it is equipped in such a way that it qualifies for a maximum speed of 100 kilometers per hour.
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