Abstract: Device for suction and collection of the exhaust gases of a vehicle, comprising a slotted suction duct, at least one carriage which is mobile along guide rails, with which there is integral one end of a flexible tube, by means of which the exhaust gases are sucked from the exhaust pipe of the vehicle; which device is characterised in that there are associated with the drive device of the carriage selective means for locking the drive wheel onto a shaft which is rotated by the drive device, and in that in all the operating steps, the drive wheel is always in purely rolling contact with the relative track.