Explanation: If your vehicle breaks down, use hazard warning lights as well as a warning triangle or other device to warn other drivers. It's even more important to do this in the dark. Warning triangles should be placed at least 45 metres (147 feet) from your vehicle and on the same side of the road. Don't use a warning triangle on a motorway.
Category: Band 1 road procedure
References: The official DVSA guide to driving: section 15, Highway code: rule 274