When transporting loose substrates, such as sand, the following must be ensured:

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The load must be secured so that it does not fly off spontaneously, for example by a tarp.

The vehicle must be equipped with a special orange warning light, which must be switched on while driving.
The vehicle must be visibly marked with a special marking for vehicles transporting loose substrates.

Legal Basis: You can find this in § 52, paragraph 6 of Act No.

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Legal basis: Zákon č. 361/2000 Sb., § 52 odst. 2

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