A car can only travel three-quarters of the road without guardrails. A 2000-meter-high cliff lies on the other side of the road. It is necessary to drive a 4WD vehicle on parts of the road because they are so bad.
20. Pan American Highway - American Continents
Twelve countries and several different climates are crossed by the 19000-mile highway. The majority of the route is in the desert, where there are little or no resources. When you have an accident on the road, you're in bad luck.
