Sichuan-Tibet Highway
Needless to say, a road that spans more than 14 miles would be truly dangerous. One of the things that make it so difficult would be the oxygen levels. They are only half of what you get at normal sea level.
Watch Out For Landslides
As you can probably imagine, landslides are pretty common occurrences on this highway as well. This is something all drivers should look out for if they ever find themselves on this long stretch of road.