Correct answer
Mandatory circulation for vehicles transporting more than 1,000 litres of water-polluting products.
The mandatory vertical sign R-415 in the image indicates that from this point onwards, you must use a carriageway that is mandatory for vehicles transporting water pollutants. Specifically, it indicates to those drivers transporting more than 1000 litres of products that may pollute the water that this is the route they must take and obliges them to use it.
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Recommended circulation for vehicles transporting products that pollute water.
Mandatory circulation for vehicles transporting easily flammable goods.
Mandatory circulation for vehicles transporting more than 1,000 litres of water-polluting products.
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Sign R-415: a carriageway for vehicles carrying products that pollute water
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