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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