
To speak of the four arrows is the highway code, which establishes that these must be used in different situations.
For example to report The size on the roadway
Four arrows, where they are positioned and what they are for
In any case, the four arrows are present in front, which behind and sideways to each machine. All cars have two in front of them, two behind and two lateral ones, which aim to report the presence of a stopped vehicle where it should not and could not stop, or a vehicle in slow movement or in failurewhich must be overtaken in order not to create a hindrance to circulation.

When it is appropriate to use the four arrows and what you risk if not
As regards the situation of clutter of the carriageway, it could indicate that the vehicle is stopped in a lane or that due to an emergency or an accident, nON you have the opportunity to move it where it does not bother or does not create problems. The same thing happens when proceeding slowly due to a mechanical problem of the car, in this case Cading the four arrows, the other users present on the road that is being proceeded slowly Only because the car has a problem and not because there is a slowdown in circulation.
In the last case we talk about sudden slowdowns, which can happen on the highway for example when The lanes are closed for the work in progress And you are forced to go to the other side or where the direction of travel is opposite. Or because there is an accident for which you are forced to slow down that it means that very long queues are created and the situation could become dangerous if those who are coming do not realize in time.
In this case, there is a risk of causing a chain rearrangement. The highway code sanctions those who do not use the four arrows in all these situations. So if the law is not respected, you risk catch a fine ranging from € 42 to 173 € i