Under ADR 8.1.5.2, what self-standing warning signs must be carried on board a transport unit carrying dangerous goods to mark the vehicle in case of a breakdown or accident?

1. A flares pack containing pyrotechnic road flares
2. Two self-standing warning signs (e.g. reflective cones or warning triangles or orange flashing lights independent of vehicle electrical system)
3. Four white candles with matches
4. One red flag on a wooden pole