( My apologies to the list for inadvertently regurgitating an undigested
reply back onto the list )
> I think I like the "bridge:movable" suggestion made there. (So movable
> bridges would be tagged, e.g., "bridge=movable; bridge:movable= bascule"
> and so forth.)
>
So would there be a reflective tag "bridge:fixed", etc. (I'll go look)
That also makes it a little easier to parse for a (hypothetical)
> downstream piece of routing software; it doesn't care to learn about
> all the different varieties of movable bridge, it just needs to be
> able to spot bridges that could open and leave you stuck in a traffic
> jam.
>
Which is what prompted my question about the individual span types, the
various bridges have names like 'The Eastern High Rise', etc. that radio
traffic announcers and EMS uses, and there are exit opportunities for some.
> > This is my approximation for the eastbound lanes
> of I-90, moving from west to east. Segment 1 (over roads):
> "bridge=yes; bridge_type=beam". Segment 2: "bridge=yes;
> bridge_type=truss". ("bridge=viaduct" might be OK for this, too;
> that's sort of a matter of taste.) Segment 3: "bridge=yes;
> bridge_type=arch". Segment 4: "bridge=yes; bridge_type=floating".
> Segment 5: "bridge=yes; bridge_type=arch". Segment 6: "bridge=yes;
> bridge_type=beam".
>
Thank you for your time constructing the example.
> > .... And this kind of "span-by-span" breakdown does have some potential
> when it comes to navigation. In bridges crossing navigable estuaries, it's
> not uncommon to have a long series of fixed spans with a movable span
> somewhere in the middle over the navigation channel. In that case, it's
> certainly useful to distinguish between the movable and the fixed spans, as
> it defines the location of the channel.
>
I've noticed around here maintenance, reconstruction
like seismic refitting, etc seem to be defined by the span type. So I think
it would be useful also.
Michael Patrick
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