Do you ride a bike? Longitudinal ridges are awful unless you're perfectly straight on and don't bump into them. Otherwise they tend to push your wheel away from the direction it was going into the direction of the ridge, and can cause scary wobbles, or worse.
A bit of googling finds me this interesting small paper:
"Almost one fifth of the crashes [caused by the road surface] resulted from longitudinal grooves or raised edges in the road surface. A wheel can easily skid when crossing raised edges or tram rails at too small an angle. The front wheel skidded and got stuck in the tram rails in a few cases. "
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Date: 2016-06-15 05:10 (UTC)A bit of googling finds me this interesting small paper:
http://www.avon.nhs.uk/phnet/avonsafe/Cycling%20Injuries/Schepers%20and%20Klein%20Wolt%20Cycling%20research%20international.pdf
"Almost one fifth of the crashes [caused by the road surface] resulted from longitudinal grooves or raised edges in the road surface. A wheel can easily skid when crossing raised edges or tram rails at too small
an angle. The front wheel skidded and got stuck in the tram rails in a few cases. "