Automatic-setting rollsigns are common on many light rail and subway/metro systems in North America, and in the U.K. such capability is standard on the so-called "bendy buses" (articulated buses) of Transport for London (TfL) and in Citaro Gs, when equipped with blinds.
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They are typically used outdoors in store signs and billboards, and in recent years have also become commonly used in destination signs on public transport vehicles or even as part of transparent glass area.