this post was submitted on 28 Nov 2025
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xkcd #3174: Bridge Clearance

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/

explainxkcd for #3174

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[–] skibidi@lemmy.world 45 points 2 days ago* (last edited 2 days ago) (5 children)

Well.. Earth's rotation would mean that the top of the lorry would be moving at 3.3 million light years per second ... Or you know, about 100 trillion times the speed of light.

That might break some things.

[–] Cocodapuf@lemmy.world 14 points 2 days ago* (last edited 2 days ago) (3 children)

At this point I'm actually curious about the mass of the lorry.

I wonder if we could estimate the mass of a lorry, 2.5 meters wide, 20 m long, 46 billion light years tall. Let's assume it's filled with jars of peanut butter.

At that size, it could well be the most massive object in the universe.

Now that I think about it, it could also be too tall, possibly a tipping hazard around turns.

[–] zabadoh@ani.social 5 points 2 days ago (2 children)

That truck tipping over could wipe out every lifeform on the planet with nut allergies.

The sheer mass of Skippy would become a fully functional ecological system of its own before cleanup was finished.

[–] Cocodapuf@lemmy.world 3 points 2 days ago* (last edited 2 days ago) (1 children)

I mean, it has the potential to wipe out all life even without nut allergies. I for one have an allergy to things falling from the sky at c fractional speeds.

Take a Claritin, you'll get over it

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