UPDATE: Libelium has launched a new platform to detect any Smartphone (iPhone / Android) in a certain area by detecting Wi-Fi and Bluetooth frames without the need of being connected to an AP. Read more in this article: Detecting iPhone and Android Smartphones by Wifi and Bluetooth.
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The Vehicle Traffic Monitoring Platform from Libelium allows system integrators to create real time systems for monitoring vehicular and pedestrian traffic in cities by using the new Bluetooth - ZigBee double radio feature available in the Waspmote sensor board. The new Vehicle Traffic Monitoring Platform, part of the Libelium Smart Cities solution. The platform is capable of sensing the flow of Bluetooth devices in a given street, roadway or passageway differentiating hands-free car kits from pedestrian phones. Sensor data is then transferred by a multi-hop ZigBee radio, via an internet gateway, to a server. The traffic measurements can then be analysed to address congestion of either vehicle or pedestrian traffic.