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When I was a child, I remember most cars having a grounding strip, like the one in the picture below:

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But nowadays, I don't see any car having them. What is the reason they have disappeared / become unneeded?

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    Because they were about as useful as the furry dice... Another marketing thing was they were to reduce travel or motion sickness... – Solar Mike Jun 19 at 17:04
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Primary reason would be that vehicle electrical systems ground to the body, not to earth. They're effectively useless.

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    The role at the time was to avoid shock when touching cars since they're isolated from the earth, through the tires, and would build up static electricity, presumably through air friction. I don't think it had anything to do with the electrical system of the car. – Thomas Jun 19 at 17:00
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Back in the day we would often explain away customers complaints about static shocks as the fault of fiber glass belted tires. They were the cheaper alternative to steel belted tires. Maybe they were the cause or it was an excuse to upsell to steel-belts.

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