During high summer temperatures, what is the major risk regarding passenger bus tires, and what is the strictly prohibited response to an overheated, high-pressure tire?

1. Tire internal temperature and air pressure rise significantly, increasing blowout risks; drivers must NEVER deflate (放气) or pour cold water (浇冷水) on hot tires, but must stop in shade to let them cool naturally
2. Tires lose pressure in hot weather; drivers must immediately pump 50% more air into hot tires
3. Drivers must splash buckets of ice water directly onto red-hot brake drums and tires while driving
4. High tire pressure is beneficial in summer and drivers should travel at maximum possible speeds