Date Added: Apr 2011
Existing deployments of Wireless Sensor Networks (WSNs) are often conceived as stand-alone monitoring tools. In this paper, the authors report instead on a deployment where the WSN is a key component of a closed-loop control system for adaptive lighting in operational road tunnels. WSN nodes along the tunnel walls report light readings to a control station, which closes the loop by setting the intensity of lamps to match a legislated curve. The ability to match dynamically the lighting levels to the actual environmental conditions improves the tunnel safety and reduces its power consumption.