Special regulation sign

Special regulation signs are

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]

• 
  German "one way" sign
• 
  Begin pedestrian zone
• 
  End pedestrian zone
• 
  Right turn on red permitted
• 
  British "Home Zone" sign (Residential zone)

References