Touching a windscreen prevents stone damage
There's a long held belief that putting your finger on the inside of your windscreen when passing cars on a gravel road will prevent damage to the screen by absorbing the shock of any stones hitting it. I've never believed this, as surely the soft rubber seal that holds the screen in place would also help.
But it would be difficult to test also. I've seen this many times in Ireland, and have heard about it in the UK as well.
Anywhere else this might be the case.
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