On the occasion of the 99th anniversary of the opening of the urban railway "Roma - Giardinetti", Roma Servizi per la Mobilità srl (Roman company for mobility services) installed Sky Light Intersection System by Nabla Quadro. The purpose is to monitor traffic flows involving roads and railway in via Casilina in Rome for adaptive traffic light control. Four Sky Light Sensors are aimed at car detection, while two sensors have been placed between tha rails to monitor train traffic. This is the first case of a wireless sensor network for traffic monitoring.