ZZ1010-51
Supplementary plate 1010-51: Motor vehicles over 3.5 t

Explanation
The main sign applies only to motor vehicles over 3.5 t permissible total mass (including trailers) and tractors; cars and buses are not included.
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Lesson L24 · Supplementary signs, markings & traffic devicesVehicle types and special notices↗Similar signs to tell apart
Supplementary plate 1010-57: Buses
Supplementary plate 1010-58: Cars
Supplementary plate 1010-59: Cars with trailers
Supplementary plate 1010-62: Motorcycles and mopeds
Supplementary plate 1053-33: Weight (7.5 t)
Supplementary plate 1044-10: Disabled permit holders only
Supplementary plate 1060-31: No stopping on the hard shoulder tooTest yourself on these signs
A one-minute drill: pick the right meaning for each sign.
Legal basis: § 39 StVO