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The story
A dashcam video posted to 5ch shows a car crossing the no-passing line on a curve, drifting into the oncoming lane, and colliding head-on with a motorcycle coming the other way. The thread erupted into arguments over fault ratios (“10-10,” “5-5”), and posters were also split on whether the footage was recent or nearly 20 years old.
What people said
Both sides share the blame
Though that's hindsight talking
I think the guy who ran up to help is the dashcam driver — didn't he yield to the bike?
Either way, the timing, the spot, and the luck for passing were all bad
Nah, people usually call that 5-5 lol
The yellow-line cut right before is a separate issue
Both of them broke the rules
I know that already
But the car is the one unilaterally at fault in this accident
The bike that had just passed him on the curve swerved right in front of him trying to dodge the oncoming motorcycle, which made him slam the brakes without meaning to — and that's exactly what let him dodge the car that shot across the center line, by a hair
If that bike behind him hadn't passed when it did, he'd have been in the crash 100%
It clearly hits him though
Has to be like 20 years old
Way too many people cashing in on old footage these days
Dashcams weren't even common 20 years ago, and that car pulling the understeer sure doesn't look like a 20-year-old car either lol
https://x.com/risata_sl/status/1644323855056654336
Background and Key Points
The car crossed a solid orange no-passing line to overtake on a curve and hit an oncoming motorcycle head-on.
In Japan, road markings use two distinct yellow/orange lines: a center line that simply forbids crossing to pass, and stricter no-passing zones marked on blind curves, hill crests, and similar low-visibility spots where crossing is illegal regardless of traffic. Japan’s fault-ratio system (過失割合, kashitsu wariai) assigns percentage blame to each party in a collision — insurers use these ratios, expressed as things like “10-0” or “5-5,” to divide compensation. A “10-0” (or “10-10” in the loose slang used in the thread, which really just means “the car is fully at fault”) means one side bears the entire loss; anything less means both sides pay a share. This is why the numbers matter so much to Japanese posters: they translate directly into money and insurance outcomes, not just moral blame.
The thread split over exactly how to apply that framework. Some posters treated the car’s line-crossing as clear-cut 100% liability; others pointed out the motorcycle was also passing over a similarly restricted line moments before, which under real fault-ratio precedent could shave a small percentage onto the biker’s side even though the car obviously caused the collision.
What the thread never resolved, and what outside readers should know, is that Japanese fault ratios aren’t decided by online consensus or “vibes” — they follow standardized tables published by courts and insurers (the Green Book precedents) based on precise circumstances like sight lines and signage, not just who technically crossed a line first.
*This article is excerpted and summarized from a 5ch (Hello! Project board) thread, “[Video] Kei Car Blatantly Crosses a No-Passing Line on a Curve, Hits an Innocent Biker (“バイカス,” mocking slang for motorcyclists).”
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