Slow or stationary traffic may be ahead, so be prepared to slow down or stop.
Reduce speed and leave enough space to stop safely. The back of a queue may be hidden beyond a bend or a crest.
Common triangular designs have a red border and a symbol showing a line of cars. France’s AK30 is a temporary warning sign with a yellow background and warns of a queue ahead.
Official sign in each country; the code is its number in the national rules. Signs that come in two directions show the left and the right version.
Sign images from Wikimedia Commons, used under their licences.
