If you feel tired while driving, what should you do until you can stop?

If you feel tired while driving, ensuring a supply of fresh air can help you stay alert and reduce drowsiness. Fresh air can invigorate the mind and improve focus, which is essential when you're operating a vehicle. It helps stimulate your senses and keeps you more aware of your surroundings.

Other strategies for maintaining alertness, like elevating the volume of music or driving faster, are not effective for combating fatigue and can even be dangerous. Elevating music volume may momentarily distract you but does not address the root cause of tiredness. Driving faster is particularly risky, as it increases the chances of losing control of the vehicle, especially if you are already fatigued. Furthermore, taking breaks every hour is indeed a good practice but is not an immediate solution if you are feeling drowsy at that moment.