It's true that driving at elevations above 5,000 feet requires significantly less oxygen and can quickly wear you out.
There is significantly less oxygen available when driving above 5,000 feet, so fatigue can set in quickly.
Is breathing affected at 5000 feet?
Although the usual threshold for HAI is 8000 feet (2500 meters), some people are more sensitive to low oxygen levels and may become ill at altitudes between 5000 and 7000 feet (1500 to 2100 meters).
Why is fatigue caused by high altitude?
In HAPE, fluid builds up in the lungs, leading to fatigue, shortness of breath while exercising, and eventually breathlessness when resting. The illness has the potential to kill if the person does not descend. Altitude sickness is always treated by descending to a lower altitude, often quickly.
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