Surely every motorist paid attention to the fact that truckers who drive road trains very often glue speed limit signs on the trailers of their trucks. For example, with indicators "70" or "80". As a result, many people have a number of fair questions regarding whether it is worth paying attention to such restrictions at all and whether these stickers really work as real signs.
The answers to all the questions that arise are quite simple. It should be noted right away that road signs-stickers (and any other signs) applied to the body or side of the truck do not have any legal force. In the traffic rules there is not a word about such creativity of heavy truck drivers, so by and large, you can not pay any attention to such stickers.
However, the fact that speed limit stickers on a truck are not legally binding does not mean that they all make no sense. In fact, heavy truck drivers fix them not so much for themselves as for others.
There is only one function - informational. With the help of stickers of this kind, a trucker, in the overwhelming majority of cases, tries to inform others about the average speed at which his car will move.READ ALSO: Why were glass balls made in the USSR, which children in the yard wanted to get
The sticker on the trailer is a kind of "sorry, I can't take it anymore, I'm going loaded." In other words, all cars that are not ready or unable to follow the truck at its speed should simply go to overtake at the first convenient opportunity. Sometimes it happens that there are several stickers on board the car at once. In this case, the trucker wants to emphasize several possible speed modes of the truck at once, which can vary depending on the situation. Most often, for city driving, they attach a sticker "60", for a highway - "80", and for all other cases they indicate the maximum possible, often it is "90".
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Continuing the topic, it is worth reading about why do american trucks have long hoods, but the domestic - no.
A source: https://novate.ru/blogs/290920/56200/