Your goods vehicle weighs over 3 500 kg and breaks down on a public road. What warning device must be carried, and how far from the vehicle should it be placed?

1. A reflectorised equilateral triangle with sides of at least 400 mm, stood not less than 30 metres from the vehicle
2. A red cloth flag of at least 300 mm square, laid on the bonnet
3. A hazard lamp only, placed directly against the rear bumper
4. No device is required if the hazard warning lights are working