Title text:
Highway engineers like Planck units because, like the speed of light, the energy capacity of a typical car's gas tank is 1.
Transcript:
Transcript will show once it’s been added to explainxkcd.com
Source: https://xkcd.com/3289/
http://www.rogermwilcox.com/Planck_ruler.html
I can't believe I get to share this old website and have it be relevant for once!