The Physical-World Example Behind the 'Curb-Cut Effect'
Curb cuts — the sloped ramps at street corners — were originally built for one specific population, but today they also benefit a much wider range of people who were never the intended audience: a parent pushing a stroller, a delivery worker with a hand truck, a traveler rolling a suitcase, a cyclist.
Who were curb cuts originally designed for?
The correct answer is "Wheelchair users."
Curb cuts were built for wheelchair users — a permanent-impairment case — but now also help a parent pushing a stroller, a delivery worker with a hand truck, a traveler rolling a suitcase, and a cyclist, none of whom are the population the ramp was designed for. The digital equivalent — captions, keyboard operability, clear error text — follows the identical shape: a solution scoped to a permanent-impairment requirement ends up serving a far larger group who encounter the same barrier temporarily or situationally.
Cyclists, parents with strollers, and delivery workers with hand trucks are all examples of groups who benefit from curb cuts today — they're the "everyone else" the effect describes, not the original intended population the ramps were designed to serve.
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