If a tire catches fire on an EX vehicle carrying Class 1 explosives while driving on a highway, what should the driver do?

1. Speed up to 80 mph to blow out the flames with wind
2. Drive into a petrol station forecourt for water
3. Stop safely in a clear area, isolate the vehicle, attempt to extinguish the tire fire using portable dry powder extinguishers/water before it spreads to the body, and call 999
4. Ignore the tire and continue driving to the destination