221Using hazard warning lights

221 Using hazard warning lights (1) The driver of a vehicle fitted with hazard warning lights must not use the hazard warning lights, or allow them to be used, unless— (a) the vehicle is stopped and is obstructing, or is likely to obstruct, the path of other vehicles or pedestrians; or (b) the vehicle is a slow-moving vehicle and is obstructing, or is likely to obstruct, the path of other vehicles or pedestrians; or (c) the vehicle is stopped in an emergency stopping lane; or (d) the driver stops the vehicle to sell a product (for example, ice creams) that may attract children onto the road; or

(e) the driver is driving in hazardous weather conditions (for example, fog or smoke); or (f) the vehicle is a bus that— (i) is not fitted with any other warning lights in accordance with the Road Transport (Vehicle Registration) Regulation 2000, schedule 1 (Light vehicle standards); and (ii) is carrying children, and the driver stops the vehicle to drop off or pick up a child; or (g) the hazard warning lights are operating as part of an anti-theft device, or an alcohol interlock device, fitted to the vehicle. alcohol interlock device means a device in a vehicle that is designed to prevent the vehicle from being started or driven unless the device is supplied with a breath sample that contains either no alcohol, or less than a certain concentration of alcohol.