Traffic sign A31: Roadworks

The A31 sign announces works on or beside the public road. It is the basic sign of any worksite signage: it stands before the works zone, normally about 150 metres ahead, and the end of the zone is marked with the F47 "end of roadworks" sign.

Warning signs are triangular with a red border. They warn of a hazard ahead and are normally placed about 150 metres before it (Highway Code, art. 66.2). On a worksite they announce what the driver is about to meet: roadworks, a narrowing, an uneven surface.

Anyone who puts up a traffic sign on the public road for works needs the consent of the road authority: through the occupation permit or through a signage permit with a signage plan. Without that consent you may not put up the sign.