A mobile device runs a tolling application program that, in part, can perform several vehicle occupant detection processes in order to verify the number of occupants in a vehicle. When the number of occupants is verified, then (when the number is more than one) discounts on tolls can be applied to toll transactions. In order to avoid the effect of false positive detections, several occupant sensing modalities are used and the results of each are evaluated to ensure that the correct number of occupants has been determined.
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