Disclosed is a system or a function of which in combination with a navigation device of a vehicle regardless of whether in this integrated or mounted additionally in the case of certain criteria, a warning is automatically in the form of a text -, - and / or audio request instruction. This system detects on the basis of location by means of satellite (gps - global positioning system) of the position in which a vehicle is located and the speed with which the vehicle is moving. By means of the determined gps - data and a corresponding local road maps, which are played on the navigation devices, this system liquid, of a sluggish and poles ndem traffic jam) differ from one another (. With this information, the system in the case of a traffic jam information on the forming or maintenance of a rescue channel output to the driver, so that rescue - and service vehicles of the way to the road is kept free.n="9"
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