Warns of an area with an increased risk of frequent icing on the road .
Warns the driver of a car with 3 or more wheels to continue driving only after installing at least 2 driving wheels with snow (anti-slip) chains .
Orders the driver of a vehicle of category M or N to continue driving only after fulfilling the legal conditions for the movement of cars in winter, and without taking into account the date and current or forecasted weather conditions .