If a trailer, due to its dimensions after connection to the towing vehicle, prevents the driver from having a proper view via the external rear-view mirrors:

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Correct answer

The towing vehicle must be equipped with additional rear-view mirrors with a larger projection or another device that ensures a proper view.

Such a combination may only be used in road traffic on class II and III roads and local roads.
Such a combination may be used in road traffic.

What the law says: If a trailer blocks the view in the external mirrors, additional mirrors must be fitted.

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Legal basis: Vyhláška č. 341/2014 Sb.

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