the.com/carpool

Four people, one car, and a shared agreement to pretend the small talk is fine.

means An arrangement where several people share a single car for a regular trip, usually commuting to work or school, taking turns driving or splitting the cost.

from A straightforward 20th-century compound: 'car' plus 'pool,' in the sense of a shared pool of resources (think 'typing pool' or betting pools where people pool their money). The word surged during fuel shortages and wartime rationing, when sharing rides stopped being a courtesy and became a civic duty — government posters of the era literally urged people to 'join a car pool.'

origin
term dates to 1940s wartime gas rationing
etiquette rule
shotgun goes to whoever is being dropped off last
math
splits gas cost but never splits the awkward silence
lane perk
hov lanes exist entirely to bribe you into sharing
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