[Tagging] Bridges and layers

[Dave F.]

  On 26/07/2010 13:35, Nathan Edgars II wrote:
> On Mon, Jul 26, 2010 at 8:28 AM, Dave F.<davefox at madasafish.com>  wrote:
>> Layer is used purely as an aid to the renderer to distinguish where two or
>> more ways *cross* each other:
> Not quite purely - it gives nonredundant spatial information when a
> bridge goes over another. Not that this has anything to do with the
> layer_change proposal.

"nonredundant spatial information"

What's that when it's at home?
(http://www.urbandictionary.com/define.php?term=what%27s%20that%20when%20it%27s%20at%20home%3F)

Cheers
Dave F.