What information is recorded when the vehicle is detected on a free-flow motorway?

On a free-flow motorway, the system detects and identifies the vehicle and its category thanks to different sensors, regardless of the vehicle's speed or its position in the lane.
Different information is gathered every time that a vehicle passes under the gantry in order to determine the toll amount due:

• time of passage
• place of passage
• traffic lane
• the characteristics of the vehicle (height, number of axles, trailer, caravan or towed unit, etc.)
• vehicle registration plate

Vehicles belonging to clients who have subscribed to the Liber-t toll payment system are identified thanks to the tag, provided that it is correctly attached to the windscreen.