System and method for associating devices moving along the same travel path

A method of temporarily associating a first mobile device 22 with a second mobile device 200, by processing positional data relating to the position and movement of a plurality of mobile devices with respect to time in a geographical region. The positional data is process to determine if a first mobile device 22, such as one carried by a user, is moving concurrently with a second mobile device 200, such as one associated with a vehicle 14, along substantially the same travel path. When such a determination is made, a temporary association is created between the first mobile device 22 and the second mobile device 200, e.g. at a server 10 to allow for data to be exchanged between the two devices.