What does the sign mean?

1. AThe maximum permitted speed on the road is 55 km/h.
2. BRoad for a motor vehicle capable of and authorised to travel at least at the speed stated on the sign (in km/h).
3. CTravelling at a speed lower than the speed stated on the sign (in km/h) is forbidden.
4. DTravelling at a speed higher than the speed stated on the sign (in km/h) is forbidden.

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