This publication describes a method and a system for registering use of studded decks (6) and for collecting due toll for use of studded decks on a vehicle (19) having at least one studded deck (6). This is done when a vehicle (19) passes over a detection device (1) on a road surface (18) of a road, the detection device (1) being associated with one or more sensors (2) that is able to detect impulses created by the decks (6) on the vehicle (19) that passes over the detection device (1). The impulses are registered and compared with a pre-determined value that enables a processing device (3) to determine whether one or more of the decks (6) are provided with studs or not. The system is configured in such way that the processed signal provides basis for collecting toll or at least bringing this fact to the attention of the driver and that toll is due.