In my game it was wide enough for probably 8 men across and was held by a small heroband, just the right size for the best fighters in the player group to hold it for a short while against a century of hoplites.
Thinking about it, it may be as well to leave it undefined for narrative reason. What I know of engineering though I would expect it has to be larger than 'the bridge of khazad dum' motif. But the size could be fitted to the needs of the narrator as the arguments are valid either way.
Best regards, Rob
>
>
> --- Joerg Baumgartner <joe_at_...> wrote:
> > Tarkalor brought trade to Whitewall. Is it just me,
> > or would that mean
> > two-way travel across the bridge, i.e. two wagons
> > wide?
>
> Your logic is impeccable, but sadly removes the
> dramatic possibilities of a bridge narrow enough to be
> held by a single hero (or group of PCs).
>
>
> > The bridge spans a rather long gap.
>
> True. And shortening it would make it too easy for the
> gap to be bridged by other means.
>
> > If it is a single arch rather than a
> > viaduct with lots of columns downward, ...
>
> If. Is it? I believe we drew it as a viaduct. My
> engineering days were a long time ago, but it seems to
> me that that's a long way for a single span. I can see
> four possibilites rather than two:
> 1) Arch - stone built, keystone in the middle, steep
> up and down.
> 2) Viaduct (what are the central pillars resting on,
> and how tall are they?)
> 3) Suspension bridge. There's a nice White Cliff to
> attack to at the city side, what do we have at the
> other? Towers?
> 4) A really long, strong, single-piece slab - stone,
> wood, whatever. It couldn't be done in RL, but Mostali
> magic - maybe.
>
> > Backing up a heavily loaded wagon is hard. A trade
> > route ought not make that a normal event.
>
> I agree. If we were to go with the arch option, would
> a passing place (and control point) at the top of the
> arch make sense?
>
>
>
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