Telepass users must use lanes designated with the Telepass logo and travel no faster than 30 km/h when in the Telepass lane. Once the OBU has been identified and verified, the OBU emits a single high beep, and the barrier blocking the lane is lifted. When the user exits the toll lane, the OBU emits a second single high beep. A series of three high beeps indicates the OBU's battery is nearing exhaustion and the OBU or its battery should be replaced. A low beep indicates the OBU has not been able to communicate with the toll station, was identified as blocked, or, in case of Telepass Ricaricabile, does not have sufficient funds left to pay for the toll incurred. In all these cases, the barrier remains closed, and the user must signal the toll station supervisor by pressing the red Help (Assistenza) button. The number plate is then photographed, and the vehicle allowed to continue. The vehicle is subsequently identified by its number plate, and the owner is sent a bill for the toll which could not be collected automatically.
