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xkcd #3174: Bridge Clearance
(imgs.xkcd.com)
Title text:
A lot of the highway department's budget goes to adjusting the sign whenever the moon passes directly overhead.
Transcript:
Transcript will show once it’s been added to explainxkcd.com
Source: https://xkcd.com/3174/
For users of non-retarded units: 10ft 6in = 3.2m
Otherwise cool xkdc