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Old car headlights were all the same — which was a fairly bright idea

Technology Connections · 2.5M views · 2022-10-16 · 25:21

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Overview

Technology Connections explains why American cars all had the same standardized sealed-beam headlights until 1957. It covers the regulations behind the design and the effect on night visibility.

On Hacker News

Recommended as a clear explanation of why old headlights looked as they did, and as a case study in mandating requirements versus solutions.

Recommended by 4 HN people across 3 months · HN mentions 2022–2023

Topics

Cars, EVs & motorcyclesEngineering & making (other)
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headlightssealed beamregulationcarsstandardization

What people said

jameshart · 2023-03 · Strong recommendation

Tech Connections has, as so often the case, a great video about why old car headlights were the shapes they were - and why in later models they often changed: [VIDEO]

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dharmab · 2023-07 · Recommendation

There's two major safety issues: You can't see around cars to be able to pass. Okay, so you often don't pass. But much more importantly, car headlights aren't symmetrical. The one pointing towards the oncoming lane has a "cut" beam to avoid blinding other drivers while the other has a taller beam to improve visibility of anything entering the road. When you drive LHD in a RHD country, or vice versa, you are blinding other drivers while having low visibility of pedestrians and animals. Technology Connections did a great video about this. His solution was to stop driving his RHD car in low light. [VIDEO]

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xani_ · 2022-10 · Recommendation

Also interesting piece about why US was stuck in decades of same light design because of more stupid regulations [VIDEO]

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Sources

Video by Technology Connections, played through YouTube.

Data and selection notes

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