[ksenzee]

My theory is that people act like jerks behind the wheel, and come across as jerks even when they're not, because drivers have no way to apologize or ask please or do any other polite thing. All they can do is honk the horn, which is like yelling "HEY!!" If there were a communication mechanism for "excuse me, the light is green now" and "oops, so sorry, didn't see you there" driving would be easier and more pleasant.

[rhacker]

I feel like in large cities the majority of drivers actually practice "mean" driving techniques - tailgating, lane protection (preventing people from merging-in when they have to), zoom-ups near contest areas, loud-music in communities, lane weaving.. I've left the bay area a long time ago now, but it's amazing when you live outside of that a couple years how awful people are behind the wheel. I would call it passive-aggressive behavior and it is really really bad to ones mental health. Bay area, Denver, Portland, Seattle there's a few others out west here - but make no mistake, the actions people take while driving is 100% actual jerk, not mistaken jerk.

[zamber]

In Poland there's an unwritten custom of saying thanks by flashing emergency stop lights for two ticks. The most common use case is when someone lets you through when they don't have to.

On freeways the same is used by cars coming from the opposite direction if there's a radar ahead.

Still, in peak hours pretty much everyone is a dick, even usually chill Uber drivers.

Edit: it's also used as a "sorry" signal too.

Also, this is not local. I've seen it used all around the country.

[mantas]

Definitely not local. Pretty much a given in Lithuania too. If someone lets you in etc, it's just rude to not flash emergency lights. Even if somebody squeezed in like total dickhead during a rush hour

We use headlights to warn of friends waiting on the other side of the bush though.

[bencoder]

Also seen in London

[scaryclam]

And the rest of the UK :)

[themaninthedark]

Japan as well

[panic]

Exactly! Every communication you try to make in a car can be interpreted as aggressiveness, which escalates anger on both sides. You need a way to de-escalate.

[paulific]

Yes, in Japan there is a custom of briefly tooting the horn to say thank you (for example when someone lets you in in front of them) and they still have problems when people have different ideas of what constitutes "too long".

[patrickdavey]

Hah! I come from Ireland where the custom is also a brief flash of the emergency indicators to say "thanks". I then moved to New Zealand where they toot the horn to say thanks. I was most confused when I got tooted (rude in Ireland) for letting someone pass easily. I was like * buddy ;) then I realized what was going on, well, eventually anyway :)

[lttlrck]

Ha. In Boston I used to get frustrated at oncoming drivers flashing their lights at me. What was I doing wrong? Are my headlights misaligned? Is something falling off? Do I know you? Eventually I worked it out: they were warning me of a police cruiser ahead.

In a state known for Massholes it’s surprisingly unjerkish.

[rm_-rf_slash]

Dangerous driving can result in damage, injury, or death. That is why people are so volatile behind the wheel. I don’t think there is any system of communication that can prevent or stop road rage. Dampen, maybe, but that’s about it.

[eric_h]

If the internet has taught us anything, it's that anything that facilitates conversation facilitates all types and styles of conversation. I'd posit that a more sophisticated inter-car communication system would add at least one new road rage incident for every one it prevents.

[tlrobinson]

Paradoxically, in some places horns are used much more liberally and if you spend much time there that's the feeling you start getting from a honk. Like a "hey just wanted to let you know I'm behind you".

[c22]

When I travelled from India to Nepal I noticed that both places had liberal horn usage, but in Nepal almost all of the horns were musical. They felt much more pleasant than the same custom in New Delhi.

[SmirkingRevenge]

They often find other ways to express their jerkiness, like stepping on the gas, swerving around you and cutting you off, or aggressively tailgating, or you know... hand gestures.