The Wireless Sensor Networks are widely used to detect and exchange information and
in recent years they have been increasingly involved in Intelligent Transportation
System applications, especially in dynamic management of signalized intersections.
In fact, the real-time knowledge of information concerning traffic light junctions
represents a valid solution to congestion problems. In this paper, a wireless network
architecture, based on IEEE 802.15.4 or Bluetooth, in order to monitor vehicular traffic
flows near to traffic lights, is introduced. Moreover, an innovative algorithm is
proposed in order to determine dynamically green times and phase sequence of traffic
lights, based on measured values of traffic flows. Several simulations compare IEEE
802.15.4 and Bluetooth protocols in order to identify the more suitable communication
protocol for ITS applications. Furthermore, in order to confirm the validity of the
proposed algorithm for the dynamic management of traffic lights, some case studies
have been considered and several simulations have been performed.