Potholes can also be caused by sub-zero temperatures, where water expanding as it freezes creates cracks.Īotearoa’s wet summer, followed by a wet winter, has created prime conditions for potholes, which people were possibly particularly reminded of as they drove places during the just-finished school holidays. Once open, the pothole fills with water, which can make it bigger. Once there are cracks in the surface caused by wear, water gets into the base material and washes it out, until the hole crunches open when something heavy goes over it. Rain is one of the main causes of damage to road surfaces. To keep it short: rain ! Roads are made of several layers: the asphalt or chip seal on top, with a base material below, and then the actual soil underneath that. Why are there so many potholes at the moment? But why are we so obsessed with bumps in the road – and have they really got worse? Concerns about potholes came to a head yesterday as National announced a pothole repair fund as part of its road transport policy.
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