A process is described for manufacturing articles by selective fusion of polymer powder layers, especially the rapid prototyping by solid-phase laser sintering of a powder based on a copolyamide of type 6 having a low enthalpy of cold crystallization. In an embodiment, this comprises receiving an auditory communication with keywords identified in the communication, storing the communication on a storage device, and associating the stored communication with data indicating at least one policy invoked by at least one of the identified keywords. The acquisition PC sends the sub-streams over a network to a playback PC. The defined distance ahead of the motor vehicle depends on the currently velocity of the vehicle.