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We present a traffic probe for vehicle monitoring powered by a raspberry-pi that leverages on techniques such as the detection of signals as Bluetooth. Namely, signals spread by vehicles passing on the roadway are revealed by the battery powered boxes installed on the roadside. The entire system is proudly powered by only free and open source softwares, at the probe side upon a healthy OS level orchestrated by the Debian OS runs the bluetooth inquiring tool while at the server side the traces are gathered and analyzed by a python back-end developed with the web2py web framework. Given the growing and serious issue as the traffic jam and the continued reduction of the budget that municipalities have to deal with a sane and open source system for monitoring the traffic trends could be a starting point not only for cutting the expenditure down but also to develop an homogeneous monitoring infrastructure.