It is more likely the travel effect of vehicles on certain road surface
types. Similar to how the wind picks up waves on the ocean. Usually it
can be avoided by using a road surfacing with a higher clay content to
prevent the formation of the fine loose surface that moves easily to
create the washboard effect.
Wayne
> What causes the 'washboard' effect? Looking at it I'd think it was the
> tracks from the road grader leaving the grooves.
>
> thanks, Joel
>
>>
>>
>> I understand the 'washboard' effect happening!
>>
>>
>> Take care! Â ... Jack
>
>
>
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