> Yes, but the Bad News is that it would make "Road
> Pricing" really easy to achieve - which I think is a Bad
> Thing!

Eeeek !

> Powering them using piezo-electric generators would be a
> possibility, but I wonder how often they'd have to be
> run over to be viable?

Not too often I'd have thought. Depends what you want them
to do I suppose. If you were in a mad country (no names, you
know who you are) where frequent lane changes are a right,
not a privilege ;-) then you could expect them to be refreshed
quite often. But would anyone in such a country take any notice
of them ? OTOH, during a morning motorway crawl, alongside
the empty bus lane of course, when arguably you need more info
for drivers, maybe lane changes aren't so common. I'm not so
sure that sending info to drivers visually would work anyway, it
would have to be via transponders (RFID, FM maybe)

As you say though, if they can be used for safety, it would take
some grubby hand-wringing Arkwright to figure out that 2+2 =
a $ screwing for the motorist

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