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This is like the arguments that C programmers just need to be more careful about errors. We know that people make mistakes, get distracted, and get older. Real engineering is about designing systems which work well in actual conditions, not some unrealistic ideal case assuming perfect conditions.

It’s also simply wrong: in California, I had to show use of turn signals – not anything else – and no other place I’ve driven since has ever made me pass a test again. Assuming that everyone reads the manual and practices with every new vehicle is unrealistic, so you’re looking at potentially half-century lags between what’s tested and what people are driving.

I always wondered if Californians know what turn signals are.

About as well as the rest of the country, with the possible exception of Maryland, where they’re used to decoy people by indicating the turn required by the lane you’re in as opposed to the turn three lanes over you’re actually going to make.

I actually wonder whether google maps / Waze integration would be a worthwhile improvement: self-driving cars are a good ways off but simply signaling the direction which the driver was just told to turn would be nice, and a majority of drivers seem to be using mapping apps these days.

It is by far the worst state (or province) I've lived in for lack of turn signal usage. I want to get a bumper sticker that says, "Your Turn Signal is Broken".

How about a bumper sticker that says, "I slow down for stop signs".

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