When must you operate a flashing yellow light above the driver's cab?

1. AWhen you are driving a vehicle carrying a load wider than the width of the vehicle.
2. BWhen the length of the load or the length of the vehicle exceeds 20.00 metres.
3. CWhen you are driving a vehicle whose permitted weight is more than 15,000 kg.
4. DWhen you are driving a coupled vehicle.

Pick an answer to test yourself