A prohibition sign (on a white background with a red frame) means “Keep to the right“ and is usually used in places where the driver must change lanes and change lanes only to the right.
The sign is usually placed in front of an obstacle to warn the driver of a danger ahead. Drivers who encounter this sign must necessarily change lanes to the far right lane.
In our country, there is no such sign and perhaps it is really not necessary, since according to the road traffic law “on lanes that have two or more lanes in one direction, non-rail vehicles must move as close as possible to the right edge of the lane, except when overtaking, when making a detour or changing lanes before a left turn or U-turn“. Very often, police officers comply with this requirement and even fine a driver if he drives in the left lane when the right one is empty.
The signs "Move to the right" have a round shape, a red border and a white background. In the middle, on the right side, there is a silhouette of a truck or passenger car in black. On the left side, an arrow is shown, the tip of which points to the silhouette of the car.
Such a sign does not recommend, but obliges drivers to stick to the right lane and prohibits movement to the left. The main purpose of the sign is to make drivers of slower moving vehicles move or stay in the right lane.
For example, the Brazilian prohibitory signs R-23 (arrow against car) and R-27 (arrow against truck) clearly indicate the prohibition for such vehicles to move in the left lane. Slow-moving vehicles are required to release the left lane(s) for faster vehicles, which are allowed to overtake and then change lanes to the right.
There is no such sign in Europe yet. However, it is available in Canada, Chile, Mexico, Brazil and a number of other countries. Some sources report that the experience of using such a sign on European roads would not be superfluous, and experts are studying this issue.