Art. 20 requires speed to be chosen so you can stop before any foreseeable obstacle. For an AM rider this means:

1. Art. 20 applies only to Category B cars
2. You must keep 45 km/h even in fog so others can predict you
3. You may always ride at 45 km/h if no number sign is lower
4. Rain, poor sight, surface, traffic and the moped’s condition can require a speed well below 45 km/h