To use the crossing card, simply drive up to the toll barrier and hold the card up to the blue sticker. Crossing cards can be detected by the card reader on the equipment from a distance of up to 12 inches (30cm). You do not need to insert the Crossing Card in a slot.
A display on the screen (above the coin basket) will tell you how many crossings you have left. When the number of crossings gets below ten, an LED signal below the traffic lights will remind you to top up your card.