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Some of you are making ridiculous arguments to defend how the brake lights currently work.

Brake lights DO turn on in i-pedal, but only when your foot is fully off the accelerator. If I barely have the accelerator depressed the brake pedals do not turn on, even if I'm very quickly coming to a stop.
This is pretty agressive deceleration, much more than a car with a manual transmission.


Do I need to see the brake lights of the person in front of my to slow down? No. But it certainly helps in some scenarioes.

Do the people behind me need brake lights to know that I'm slowing down? In a perfect world no, but these people are crazy. Too many distractions for people who are either on their phone or day dreaming.

The discussion isn't about what WE need to slow down, we're talking about the distracted driver behind us that has no insurance and doesn't care.

 

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Again be in i-pedal mode and hold the accelerator down 20% constant and don't move it, its not braking that hard, the only time it brakes hard is when your at like 5% or totally out of the pedal all together. Hence why you don't see the light till then.

And yes my old v8 mustang slowed just as much downshifting as my cars i-pedal does when im still into the throttle a bit, it felt like you were applying mildly aggressive brakes.

The brake lights do not turn on even at 5% throttle. I've tested this with the Car Scanner app... Stopping from 40mph and 70mph.

5% throttle is a pretty fast deceleration and is much faster than downshifting.

 

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I understand your point, but ICE vehicles are getting rear-ended by these distracted drivers - even with perfectly functioning brake lights. And while I can't comment on the brake lights under I-Pedal (I don't use it), I can say that in Regen-3 my car has brake lights that come on appropriately when decelerating. I can't tell any difference between what my car's brake lights do now, verses my ICE vehicles of the past several years. But, yes, a distracted driver could rear end me in this Ioniq 5 - or with me in an ICE car. But maybe in I-Pedal it is a different situation than my Regen-3 brake lights.

FWIW, it is easy to test your IO5 to see the brake light functionality. I just took the car out in a low light and low traffic area near our home and I could easily see the brake lights reflecting off traffic signs (behind me when looking through my rear view mirror). When the car was regen braking the brake lights consistently came on. Yes this was true when I still had my foot on the accelerator but lifting some foot-pressure to allow regen to brake the car, and just mildly slowing it down.

The entire video was about I-Pedal, Regen 3 is completely irrelevant.

 

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It is not irrelevant to people who use Regen 3 and are concerned about the brake light safety issue. At least I was concerned if this was entirely an I-Pedal issue, or a larger Regen issue. I'd guess that there are others wondering about the same thing. Of course we could begin new threads for each level of Regen braking, and for each YT video that talks about it. But it seemed (to me) to be more relevant to simply include the regen brake light discussion in this thread.

Sure, but the video was about I-Pedal not using brake lights. Dismissing the issue entirely because "It works on Regen 3" isn't helping anyone.

In I-Pedal mode when decelerating quickly the brake lights do not turn on. I've confirmed they do not turn on even at 5% throttle. Go drive 70 MPH in I-Pedal mode and then move your throttle to 5%... It's a fast deceleration that 100% warrants brake lights being illuminated. The same is true at 40 MPH, though deceleration is not as aggresive but still warrants brake lights IMO.


I don't even use I-Pedal myself so this entirely doesn't affect me. But what the video says is true.

 

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Imperial example:
If you are driving at 45 mph, and you slow down to 0 in less than 545 ft or 15 s, the brake lights should have been ON.
If you are driving at 45 mph, and you slow down to 0 in more than 980 ft or 30 s, the brake lights should have been OFF.

speed	4.27ft/s²	4.27f/s²	​	​	2.30ft/s²	2.30ft/s²
	distance	time	< if less than​	if more than>​	distance	time
60 mph	950 ft	21 s	< brake lights ON​	brake lights OFF >​	1730 ft	38 s
45 mph	545ft	15 s	< brake lights ON​	brake lights OFF >​	980 ft	30 s
30 mph	250 ft	11 s	< brake lights ON​	brake lights OFF >​	445 ft	20 s
20 mph	115 ft	8 s	< brake lights ON​	brake lights OFF >​	200 ft	14 s

I just tested this in I-Pedal at 45 MPH > 0 in 10 seconds, or .21G's and brake lights were NOT on.

Estimating throttle was at 5% and I have a video of the Car Scanner app showing no brake light @ 5% throttle. According to the app the brake lights turn on around 2-4%, though I've seen 3% in the app with no brake light.

Whether or not people agree with this or not the video is correct. And there are laws in other countries that aren't being followed. I'm assuming this behavior is the same for US and EU models.

And FWIW, Regen 3 was similar. Brake lights do not illuminate even at 5% throttle. Breaking speed is much less in 3 vs I-Pedal though.

 

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I guess Hyundai also agreed that it's an issue.

Hyundai to update EV brake lights; our tests show how they currently may not come on - Autoblog

We test Hyundai, Kia and Genesis electric vehicles to test if they can be stopped without the brake lights coming on.

www.autoblog.com