What is meant by the illuminated 50 on the truck?

Video of a driving licence question. More info at the question page (question 590).

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Do you have an obligation to give way if a car emerges from the right (at the red arrow)?
Do you have an obligation to give way if a car emerges from the right (at the red arrow)?
The temperature outside is -5°C. Could the road surface be slippery?
The temperature outside is -5°C. Could the road surface be slippery?
Do you have an obligation to give way to A?
Do you have an obligation to give way to A?
Am I permitted to park at the red arrow?
Am I permitted to park at the red arrow?
The time is 17.00 on a Tuesday. Tomorrow is a public holiday. Does the reduced speed limit of 30 km/h apply on this section of road right now?
The time is 17.00 on a Tuesday. Tomorrow is a public holiday. Does the reduced speed limit of 30 km/h apply on this section of road right now?

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