Things you need to know when you drive in a high mountain road in the USA
Driving in a high mountain road can be a wonderful experience. But if you are not used, be warned, because it can be dangerous. Not only in winters...
Rapid weather changes occur year round without warning, so carry extra clothing and rain gear with you. Be prepared for anything, even snow in the summer months. Beware of hypothermia (body temperature lowered to the point where brain and muscle activity are impaired). Hypothermia can be fatal! Oxygen levels in the high country are about half of what they are at sea level. As a result some people experience headaches, dizziness, shortness of breath and nausea. If you are affected, rest! Avoid alcoholic beverages and drink plenty of water. Your body will usually begin to adapt in a few days. Young people or the elderly may be especially at risk for altitude sickness. If symptoms become worse, seek medical assistance. Lower humidity and higher winds in Colorado often cause dehydration, so drinking plenty of water is important even if you are not adversely affected by the altitude. In mountainous country, UV radiation is twice as high as at sea level. Avoid over-exposure to the sun, and always use sunscreen. High altitude often pose a threat from lightning. If you are travelling and see a storm moving in, retreat to lower ground. DO NOT SEEK SHELTER UNDER TREES!
Pic: https://www.tranbc.ca/2014/10/15/7-things-you-need-to-know-before-driving-the-coquihalla-and-high-mountain-passes/