 The system has nine camera gantries over the road, located eastbound at the Solfatara tunnel entrance, Agnano, Fuorigrotta, Arenella and Capodichino.On the westbound side the gantries are located at Camaldoli, Vomero, Fuorigrotta and Agnano.The camera system calculates a vehicles average speed between the gantries and coils embedded in the road measure a vehicles speed as it passes the gantries.