Ithink it has to do with wind and erosion more than anything else.
Nature can be funny about that plus once it starts when you drive on
it under power your tires hop some on it making it worse.
That is funny.
A call came in to the local radio station about that, and hte caller
thought it had something to do with the RPM's a given engine was running
at, and wonderd if this was the cause of "washboarding"... or "rilling".
I'm a road maintenance supervisor, and i look after roads trucked by
approx 35 trucks (Gravel roads), and it is simply a problem caused by
mainly rain, and to some degree the wind.
If you're talking about gravel i would say this is your answer. If
you're talking about paved roads, well i'm sure its a similar answer.
Sand. New Jersey quartz.
The funny thing is that sometimes it'll be washboarded on the
inbound side and relatively smooth on the outbound side. Doesn't
seem like wind would be a player bco the heavy brush on either
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