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[quote user="Murphy Siding"]Bucyrus makes reference to (absolute) zero-visibility.  To me, that's sort of taking the exception, and trying to work it backwards, to see the outcome if it were the norm.  99.9% of the time, it's not going to be (absolute) zero-visibility.  Therefore, it's not really applicable to use that as any kind of standard.[/quote]   I am not trying to say that zero-visibility should be the norm for the response to all fog conditions. <?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p> But sometimes there will be zero-visibility fog.  I am only asking about those times.  It is an interesting question because fog always varies as you go through it.  There is always a sense that you will be able to see your way through it.  Drivers on the highway push the limits with fog, and yet sometimes have massive pileups where the fog suddenly got too thick.  Train running pushes the limits as well.  <o:p></o:p> In fact it pushes the limits further because of what has been cited regarding the self-guiding principle, the right to the corridor, and protection of track authority.  But, nevertheless, railroad companies need to expect those relatively infrequent cases of zero-visibility or near-zero-visibility fog that are bound to occur.  I am just wondering how they deal with those cases.
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