As alredy mentioned, You have to buy the tolling unit and pre-paid the credit first. Then with every tolling gate missing the amount will be deducted from Your unit.

But beware! Youre unit must always be turn on and with sufficient credits, otherwise You can be inficted by the expensive fines or even Your vehicle can be pawned, when Youre riding without sufficient credit in Your device!

You can determine needed amount exactly here. It depends on the current date, number of axles, and emission class of Your vehicle.

When a car less then 3,5tons is pulling a single trailer, there is no need to use the unit, even when both devices are more then 3,5 tons in weight together. Only the sticker ( see ) is needed