2a: any of various testing devices or substances: such as
(1): a pointed metal tip for making electrical contact with a circuit element being checked
(2): a usually small object that is inserted into something so as to test conditions at a given point
(3): a device used to penetrate or send back information especially from outer space or a celestial body
(4): a device
Probe Vehicles: Floating Car Data. At a sufficiently high percentage of vehicles equipped with a dynamic route guidance (DRG) device acting as roving traffic detectors, a non-infrastructure based traffic monitoring system results
In contrast to speed sensors, vehicle probes directly measure travel time using data from a portion of the vehicle stream. Commercial vehicle probe data services primarily include the use of cell phones and automated vehicle location (AVL) data.Back-Probing Terminals. Back-probing terminals is done when live circuit measurements are required. It is always better to back-probe a terminal than it is to pierce a wire's insulation to obtain a measurement.