Special regulation signs are road signs that are used to indicate a regulation or danger warning applying to one or more traffic lanes, indicate to lanes reserved for buses, indicate the beginning or end of a built-up area or signs having zonal validity.
Special regulation signs are usually square or rectangle with a blue ground and a light coloured symbol or inscription or with a light coloured ground and a dark coloured symbol or inscription.[1]
Gallery of road signs
German "one way" sign (rectangular shape)
German "one way" sign (square shape)
Begin pedestrian zone (Germany)
End pedestrian zone (Germany)
Right turn on red permitted (Chile)
Parking (Poland)
British "Home Zone" sign (Residential zone) starts