4WD cars for Mauna Kea

[TomK]

Don't go at the last minute before sunset, you'll be staring directly into the sun on every other switchback.

This is an excellent tip, thank you dobanion! There have been collisions between vehicles due to this. The setting sun can be blinding and all you need is some idiot racing down the mountain and you'll never see them until they hit you. Some people have simply driven their vehicle off the road into a culvert simply because they were blinded by the sun.