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> Disclaimer—I don't myself drive a car

That reminds me of the pope, doesn't play the game but tells others how to play it.

Well, I do. I drive way too much in fact and I believe strongly that driving is a full-time 100% on the ball occupation. That probably saved my life twice this year alone and prevented one other probably bad accident from happening. I drive in places where traffic is very much unlike the traffic that you are probably used to (you'd call it a madhouse), dogs, other drivers, horse carts, madmen, trucks overtaking in blind corners, drunk people on the road (on bicycles, no lights). You name it they've got it here.

When I'm tired even a little bit I stop the car and sleep until I feel rested again. My phone is off. At night I use the GPS to tell me what's going to happen around the corner (hairpins in mountainous terrain where you can't stop are a real joy) when I can't find a place to stop safely to overnight. But as soon as I do the car gets stopped and I wait until it's light again.

I turn down the instrument panel lights to have good night vision as much as possible, this is plenty to read the instruments by if I have to and means I get to see what's on the road, which is a lot more important than whatever is on that screen. (Such as a very black and very large dog that jumped out of nowhere a few weeks ago).

This probably all may seem paranoid but it has served me very well over the years. Even so, I think that navdy has a spot, but only if you use it as a navigation device and place it outside of your direct field of vision. It screws up your night vision and that's bad enough when you have to look at it, it's much worse when that happens all the time.

The idea of 100% attention when thinking about the brain is just a simplistic notion to make discussions easier but inaccurate. Even in this simplistic approximation of the brain, the idea of 100% attention is pretty thin. If I'm driving somewhere I'm probably listening to the radio (deduct 5% attention points!) or thinking about wherever it is I am heading (deduct 5% attention points!) or if someone is actually in the car with me, I am probably interacting with them in some way (deduct 10% attention points!). And while I'm driving and keeping a constant vigil through the windshield for danger what if I see a glorious new Apple store that I didn't know existed?? That is going to hijack my brain for a bit (deduct 100% attention points!).

The radio , passengers and thoughts are much more passive and easy to tune out but even then I'm sure there have been plenty of accidents that are caused by daydreaming. A passenger can see out of the window and has awareness of the car's surroundings so they will usually know to shut up or at least not expect a quick answer to their question if you are doing a tricky manoeuvre. Electronic devices or people on the other end of a hands-free conversation both require interaction and do not have awareness of the situation that the driver is in.

Where do you live? Not arguing you are wrong, just curious.

The last 6 months I've been living in Romania.

Why vote him down? Because of his honesty?

I do drive myself. Have for 20+ years. Just drove 1300 miles over the summer vacation, sometimes on long monotonous roads, and I'd be lying if I was paying full attention all the time.

My experience is exactly as he describes. In city traffic, at traffic lights, or just before an exit, my full attention is required and constant (I actually dislike GPS because of this, it distracts, especially if notifications are late, I'm looking at you Google Nav - 'keep left at the fork').

However, after so many years of driving, I have also developed some sort of autopilot/'trance driving' mode. It is typically engaged on long legs, or when extremely tired on a very familiar route (e.g. going home). I betcha if you ask professional drivers like truckers, they'll tell you the same.

Edit: While in this mode, my 'look-ahead' window is maximized. I gaze much further ahead than I do in 'stress' situations. My focus point is definitely way past the windshield, usually several cars ahead of me. I gauge my speed by engine sound, distance to the cars ahead of me, local traffic flow etc etc. As such, I am not convinced that this heads-up display approach is a safety improvement. Sure, your eyes will be on the road, but by requiring a change of focus, you cannot look ahead to anticipate issues/changes/risks.

I have to agree. I do drive like this too over long distances. Anything else would just be too tiring. Maybe we expand the zone of perceived predictability. Fascinating stuff. Good point about having to focus in and out.

This plus Highway Hypnosis [1] show that some of us at least drive without full conscious attention.

1: http://en.wikipedia.org/wiki/Highway_hypnosis

> when extremely tired on a very familiar route

Please don't do this.

You're going to get yourself or someone else killed one day. Remember that I can do everything in my power to be a responsible driver I am still subject to the sum total of the risks everybody else takes and driving when you're that tired is an un-acceptable risk.

> when extremely tired on a very familiar route

WTF. People shouldn't drive when they're extremely tired.

Hate to be the type that pulls this one out, but when I became a parent I learned of levels of tiredness I never knew existed, and became aware of a whole segment of society (the parents) who go through most activities in their life at near crippling levels of tiredness. I agree it gets dangerous but it's not feasible to keep them off the road.

That level of tiredness is truly worse than drunk.

And yet, they will.

> Disclaimer—I don't myself drive a car, but I often observe people driving. I've observed both experienced drivers who drive frequently and more beginning drivers, the pattern described under (2) is the same.

When you're driving without distractions, sure, your mind wanders. You're thinking about a date tonight, or that jerk at work, or whatever. But as soon as your eyes pick up something of interest, like an exit sign, another driver, or a bad situation up ahead, you can immediately focus exclusively on the road. You can do this pretty quickly

Similarly, when you're carrying on a conversation with someone, the other person will generally quiet down as soon as the situation changes.

When you're on a cell phone, that changes. You're paying much, much more attention to a cell phone conversation than you are to someone sitting next to you because you have to listen harder. Not only that, the conversation is independent of the driving situation. Most people will not tell the guy on the phone with them to shut up; they'll just try to carry on the conversation. Even worse, a lot of people aren't paying enough attention to the road to realize that the situation requires more attention and that they need to put down the phone. This causes accidents.

Finally, texting is the worst - you're literally taking your eyes off the road to send a message.

Peak Hacker News/Silicon Valley: I have no idea how this system works, in fact, I've never used it. But I'm going to speculate on how it can be improved anyway.

I for one, completely agree with you. Now this is purely anecdotal, but then again everything in this debate seems to be.

I've only been driving for 7 years, but already had several benign accidents (no casualties or whatever, only some damaged metal). On each and every one of these situations, the cause was not speeding, nor my phone, nor any outside distraction, but just my mind wandering off the driving and thinking of something else.

Sometimes I get home and I do not remember the ride, not even which road I took or anything, and I think to myself, what could have happened while my mind was wandering. I just can't keep my full attention on something for that long, period.

For what it's worth, I remember reading two things:

1. Driving is one of those activities where people actually use a lot of their brains functions to do. This is partly why it can tire you out so much.

2. People speaking to a passenger drive as poorly as people otherwise impaired but the fact that they're both in the car (grounding them in the fact that they're in the vehicle) and that both of them pay some attention to the road helps mitigate the negative effects.

All I can recall is that I read #1 in a BBC News article and the latter on something I found on Google Scholar. I feel they're relevant. If you're interested, I hope it helps.

So maybe your should learn driving a car first. I agree that paying full attention while driving is definitely the hard thing to do, but it is also the right thing to do.

> I don't myself drive a car, but I often observe people driving.

Please, shut up.