

Highways 101
Sep 15, 2020
Discover the fascinating world of roadside signage, from the history of the iconic stop sign to the evolution of mailboxes. Learn about William Phelps Eno, the pioneering father of traffic safety, and his innovative ideas that transformed road design. Hear tales of reflective road markers and cat's eyes, crucial inventions that enhance driver visibility. Explore how highways shape urban spaces and the interplay between icons and public safety in our everyday lives.
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Blue Stop Sign Mystery
- A listener, Daniel, emailed 99% Invisible about blue stop signs he saw in Hawaii.
- This prompted Kurt Kolstad to investigate the history of stop signs.
Father of Traffic Safety
- William Phelps Eno, the “father of traffic safety,” heavily influenced traffic systems.
- His work included roundabouts, pedestrian crossings, and the popularization of stop signs.
Stop Sign Evolution
- Stop signs evolved over time, with no single inventor.
- Early versions varied in design, including a black-on-white version in Detroit.