In this paper a new method for real time estimation of vehicular ﬂows and densities on motorways is proposed.This method is based on fusing traffic counts with mobile phone counts.The procedure used for the estimation of tra ffic ﬂow parameters is based on the hypothesis that ‘‘instrumented ’’vehicles can be counted on speciﬁc motorway sections and traffc ﬂow can be measured on entrance and exit ramps. The motorway is subdivided into cells,assuming that mobile phones entering and exiting every cell can be counted during the observation period. An estimate of ‘‘instrumented ’’ vehicle concentration is obtained and propagated on the network in time and space.This allows one to estimate traffic ﬂow parameters by sampling ‘‘instrumented ’’traffic ﬂow parameters using a ‘‘concentration ’’(the ratio of the densities of instrumented vehicles to the density of overall traffic)propagation mechanism.
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