Originally posted by: Tot
Most of the time, potholes are caused by pebbles/stones/sand that are not sweeped of the tarmacs on the surface of the road.
As a result when vehicles passes by, it grinds the pebbles/stones/sand on the tarmac, creating a mortar/pestle effect on the tarmac. Over time, the particular spot where the pebble/stone/sand is found will eventually become a port hole. Furthermore as the number of stone particle increases as the tarmac itself breaks down, the condition deteriotrates faster.
Most of the time the pebbles/sand/stones are washed from the side of the road to the road itself when there is rain...therefore rain play a factor too.
Its important to keep stones/pebbles and sand of the tarmac, or any trash for that matter.
Regular sweeping should be reccommended.
Do an experiment yourselve. Find a nice, clean road, preferably in a high end neighbourhood where you can keep track of the traffic. Find a spot and throw couple of pebbles/stones at the spot. Come back a week or two later and Ta Da .... Potholes.
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