Abstract: An apparatus for the listening to words representative of measurements of physical quantities according to which the measurements of said quantities are listened at time intervals controlled by a timer adjustable to operate at chosen time intervals, by means of at least one reading head reading recordings of said measurements, each obtained on the side surface of a revolving record cylinder along a circumferential track, said tracks being spaced away from each other at predetermined equal distances, the reading heads being associated with reproduction circuits.

Abstract: Apparatus for detection of the presence of an automobile and its direction of movement into and out of a specific area and activating a reproducing system to provide audible and/or visual information to the driver and then resetting the system upon completion of the reproduction.

Abstract: A tape recorder module vehicle operation data, on-board. The module is removed from the vehicle and data is played back at a ground station. A telecommunication link exists with a remote data processing system for processing the played back data.