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I suspect that there would also be some negative effect of consistently increasing the cognitive load associated with driving, as opposed to looking at performance on specific roads on which a given driver probably only spends a small portion of their total drive time. At some point, I would expect the detriment of mental fatigue to outstrip the benefit of "forcing" people to pay attention.

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When I drive and see a huge truck driving at high speed from the opposite direction, I tell myself "just keep your lane, he will keep his lane too, and it will be fine" (and I probably unconsciously slow down a bit). Without the lanes I'd probably feel a bit less comfortable.

On the other hand: having visited a number of EU countries, IMO the UK seems to have 2-3x more clutter on the roads (lanes, texts for drivers and pedestrians and what not) than any other of them. They have texts everywhere!

Feeling less comfortable is exactly the point :)

This is an interesting idea. Maybe we should be looking at this as an optimization problem where drivers have a limited budget for attention and we want to concentrate it in the parts where it's most useful by varying the quality of UI assists?

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