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Whenever I see a new bridge or a sliproad being constructed, I often see
lines of wooden posts. And I have no idea what their purpose is. Each
one is approximately upright, with a smaller horizontal piece of wood
nailed to it.
You'd think this is to do with some kind of measurement or layout
process. However, the posts are all wonky and carelessly arranged,
they're not all the same height, and the horizontal piece is only at
approximately a right angle. In short, rather than being carefully and
precisely measured, this stuff seems to be haphazardly thrown together.
So... what's it for?
Similarly, you often see much larger wooden posts, painted with red and
white stripes. What do those do?
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