I hope really you can help me!
Is it legal to equip your vehicle with red flashing lights and siren if you have a First Aid Level 3 for emergency used?
No, the vehicle must be registered as a medical response vehicle. You would need to apply to the MEC for that but if you are not employed by an authority or company that provides such services it is unlikely that you will get such a registration.
Alta Swanepoel and Associates