>> Solar panels.
>
> And when do you *ever* see those in everyday life? ;-)

That's just because you live somewhere that is either cloudy or raining the 
whole time :-)  Here they are pretty common, drive through any village and 
you're bound to see at least a few buildings with them on the roof.  Also 
seen a few "solar farms" around, fields literally full of them.

As well as what Stephen said about the parking meters, I've seen them used 
for other road-side things like those warning signs that flash up your 
speed, the little mini weather stations thingies by the side of the 
motorway, etc.

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