Sound Ledger¹ (Cars, Simians)

Audio culture by the numbers

103: Number of failed attempts a driver in Wales tried to use voice verification to pay a toll

43: Number of species of monkeys and apes lacking the vocal membrane, aka voice box, likely required for speech

13: Speed in MPH below which, after 2019 legislation by the UK’s Department for Transport, electric cars must emit warning sounds


Wales: Box: MPH:

Originally published in the August 22, 2022, edition of the This Week in Sound email newsletter. Get it in your inbox via

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