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Crash Course - The SMIDSY

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3 HN users recommended this tutorial4 months2018–2023 score 5
Years with an HN recommendation, 2007–2026

HN considers it an outstanding explanation of why drivers miss motorcycles and cyclists, linked in threads on visibility and junction crashes.

A motorcycle safety video on the SMIDSY (sorry mate, I didn't see you) accident, explaining the perception and optical illusion that makes drivers fail to see riders, and how riders can spot the signs and avoid it.

“This is an outstanding vid on the whole subject illustrating the problem and some avoidance methods.” (HN, 2019)

2 strong recommendations · 2 recommendations · 1 citations · Tutorials

5 Hacker News comments

From the HN archive; up to 20 kept per video, favoring different commenters. Recommendations first.

@imglorp Jan 2018 Strongly recommends
on HN thread A Type of Road Junction that Kills Cyclists
This is also of high interest to motorcyclists who even have a name for the phenomena: SMIDSY (Sorry, Mate I Didn't See You). OP was focused on the A pillar and some other effects, while this excellent video goes a little further into some perception psychology about camouflage and how we perceive moving objects across backgrounds. You can ignore the motorcycle stuff but the explanation is enlightening. [this video]
Explains perception psychology behind drivers failing to see motorcyclists
@imglorp Oct 2019 Strongly recommends
on HN thread Lethal memory fail: Why drivers see, and then forget motorcyclists
There's a second factor at work beyond memory - it's the human visual perceptive system. Bikes are not always moving across the visual field, and they aren't fitting the pattern of a bigger single-color smooth object so it's effectively camouflage. This is an outstanding vid on the whole subject illustrating the problem and some avoidance methods. This should be taught in rider training but it's not (US). [this video]
Illustrates the visibility problem and avoidance methods
@IgorPartola Aug 2021 Recommends
on HN thread A DIY E-bike Conversion on the Cheap
Have you ever seen videos of how invisible you look despite all the high viz stuff? In some cases it becomes urban camo. Take a look at this video, especially at 2:30 or so. It’ll show you just how little visibility you’ll have: [this video] Your best bet is to have all your clothing match your bike, Power Rangers style, to increase your chances. And lots and lots of very bright lights. One little handlebar mounted light is going to look like a reflection or a flashlight.
Shows how little visible cyclists are despite high-viz gear

Citations, criticism and jokes

@imglorp Jun 2023 Cites it
on HN thread Invisibility Training for Motorcyclists [video]
Complimentary material about the SMIDSY problem (sorry, mate, I didn't see you) from someone else, including a visibility manoeuver f9 doesn't mention. [this video]
Complementary material on the SMIDSY problem with a visibility manoeuvre

Video list and Hacker News comment labels from HackerTube (prompted by @karpathy), released under ODC-By 1.0, built on the open-index/hacker-news archive. Hacker News data is provided by Y Combinator; comments remain the work of their authors. Video titles, channel names and thumbnails belong to their creators and are shown via YouTube. HackerTube Watch is an unofficial edition. Data export of 2026-10-31.

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