4WD – A Darker View

This old Land Cruiser had it’s issues… You had to jiggle the gearshift to get the vehicle into reverse. If you rolled the driver’s window up all the way it would roll itself right back down again. The key would only work one side up in the lock despite it looking exactly the same on both sides. It rattled and clattered alarmingly on rough roads. And I loved it.

That old Toyota Land Cruiser was just the right vehicle for the job.

Through the mud and ruts, up the side of a mountain, through thunderstorms and washed out roads, across an entire country… This green beast got me there. With this vehicle I enjoyed experiences that will become memories treasured for a lifetime.

It has long been policy on the Mauna Kea summit road to use four wheel drive while ascending the mountain. One of the reasons given is to slow the formation of washboard, the annoying ripples that inevitably form on gravel roads.

Convoy — A convoy of observatory vehicles heads up the summit access road

On Mauna Kea an oft cited mantra is that the use of four wheel drive when ascending the mountain reduces the formation of washboard. I have always suspected this is a mountain myth with no substance. Where does this belief come from? Is there any real information on this?

The Manuals

There are a great many references that detail the practical details of maintaining gravel roads. Generations of highway engineers have spent a lot of time studying and writing about how to best maintain gravel roads at the least cost.

The US Department of Transportation highway Administration has published a lengthy guide to the problems and solutions of gravel roads. This guide dedicates a dozen pages to the issue of corrugation or washboarding. While multiple factors in the formation and prevention of washboarding are discussed there is no mention of 4WD vehicles being a factor.

Continue reading “4WD and Washboard on Mauna Kea”

Tag: 4WD

The Right Vehicle for the Job

4WD and Washboard on Mauna Kea

The Manuals