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This is a very complicated subject. I believe Einstein studied this field for a while, but gave up.However, I think it might be something to do with spring rates and the damping devices ("shock absorbers") on vehicles.There is a possibly related phenomenon. The formation of "moguls" on ski runs. If ski runs are not groomed, they get all "mogully", and I hate moguls! [ Invalid Attachment ] That's me hating moguls yesterday.
I wouldn't be surprised to find that there's a correlation between the sizes of potholes and the diameter of the tyres that make them. Mind you, I wouldn't be surprised to find that there's no correlation either. 
Yes. If there is a crack in the road surface that lets water in, when the water freezes the expanding ice breaks up the road surface. After that there is something about the dynamics of the wheels and suspension that ejects the material from that area to create the tyre wrecking pothole. It may just be the torque applied to the driven wheels that gets it started.There is a similar effect called "washboarding" that happens on gravel roads, and that does seem to be associated with torque because it tends to happen more on hills.
Hey Neilep,I guess that, like life, some potholes are created more equal than others This is a picture of a pothole that formed in Johannesburg in South Africa after rains in January this year and I think you would need to look around a bit to fins its partner. [ Invalid Attachment ]
Hi Guys I think I actually know this one potholes tend to be similar sizes because1 your right its car tyres that determine the size of mature potholes (ones that have had time and wear)2 diesel spills which cause most potholes on tarmac roads tend to be small and provide a ''corrosion indent'' which let the tyres get to work3 ice plays a big part as witnessed on Scottish roads this spring however ice simply breaks the tar bonds and the cold temperature prevents reformation producing a small area of damage which tyres excavate. However as these potholes are normally found in repaired tarmac rather than virgin it tend to allow excavation in repair layers.4 water is the biggest digger of the lot when an ''indent'' is swept by a car tyre, water pools in the cavity and due to a combination of shock travel and wheel torque the tyre is spun in the indent and scours the inside before the shock allows full travel. That's why pot holes stay small for a long time then once reaching a certain size in relation to the prevelant wheel size they suddenly seem to become much deeper very quickly.hope that all made sense