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I assume that is partly in reference to the options amenity=chain_fitting and amenity=chain_station. Which is fair enough, I guess. But what other common meaning in the context of people driving along a highway through a snowy area has to do with chains except putting on snow chains? The only other scenario even slightly similar involve chains would be something like a heavy goods vehicles tying down their load, which is sometimes done with chains and sometimes not, but no one refers to that as “chain fitting” and there aren’t dedicated “chain stations” for it either. Just regular truck stops. So unless there’s some scenario I’m not aware of I don’t really see how amenity=chain_fitting and `amenity=chain_station’ would cause anyone confusion. Although, I don’t think it that big of deal if there’s confusion anyway since we still use potentially confusing tags regardless (whatever=bicycle for example when a bicycle can mean an extremely wide range of things to different people. Even in the UK BTW).