What does this sign mean?

En español: ¿Qué significa esta señal?

What does this sign mean?
A Dipped-beam headlights (low beam)
B Carriageway for vehicles carrying dangerous goods
C Lane reserved exclusively for vehicles equipped with an operational electronic toll device Correct answer
D Carriageway for vehicles carrying water-polluting goods

Why this is the correct answer

Electronic toll mandatory. Obligation to pay the toll using a dynamic toll or electronic toll system; vehicles travelling in the lane or lanes marked with this sign must be equipped with the technical device that allows its use in operational conditions in accordance with the applicable legal provisions.

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