>> I just noticed the other night that as I passed under a sign telling me 
>> the motorway exit was in 1 mile, I could already see the green traffic 
>> lights beyond the exit. And those lights can't be much more than 24cm 
>> across...
> 
>   Lights can be seen much easier than other details.

This is what I'm interested in. Are the lights visible from this 
distance because they glow? Or would any old object be visible from such 
a distance? (Assuming it wasn't the middle of the night, obviously.)

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