I’m trying to figure this out, but I’m not sure what it means when the HDA turns green. Does anyone know why this happens? I feel like I’m missing something.
The Highway Driving Assist indicator works like this:
Green: It means the system is active and working.
Grey: The system is on standby.
White blink: When you press the accelerator.
None: The system is off.
Here’s a link to more info on it: https://www.kia.com/content/dam/kia2/in/en/content/ev6-manual/topics/chapter6_28_2.html
@Cleo
I thought it was Hyundai Driving Assist, since I own an Ioniq.
I figured this out by accident. When you set the cruise control to match the speed limit, it turns green. But here’s the cool part: if the speed limit changes, the car adjusts your speed up and down automatically. I discovered this when I entered a construction zone, and the car automatically lowered my speed to 55 mph.
@Brown
It’s great until you pass an overpass with a school zone speed limit. I had to turn it off then.
West said:
@Brown
It’s great until you pass an overpass with a school zone speed limit. I had to turn it off then.
That’s a good point! It happens to me sometimes when I’m in a valley, and the GPS doesn’t work well, causing the system to mistakenly follow an off-ramp for a second. And in my area, traffic data is often updated during construction but not fixed once it’s over, so the car will keep the old limit after the construction ends. It’s a bit of a hassle but still better than some other systems.
West said:
@Brown
It’s great until you pass an overpass with a school zone speed limit. I had to turn it off then.
I had a similar problem with a bike trail sign. The system read that as a 15 mph speed limit instead of the 45 mph limit on the main road.
@Brown
You’ve got to be careful. There are places where I know the system hasn’t adjusted back to the normal speed after construction. You could be going 110 km/h and then suddenly the car tries to slow down to 80 km/h, which can be dangerous when you’re in tight traffic. Still, it’s not as bad as phantom braking in Teslas. I just wish there was a way to adjust wrong speed limits in my car.
@Brown
That’s pretty cool! I think all cars should have this.
@Brown
Wow, that’s interesting! I have to play with it more to understand it, since I still have no idea how I did it the first time. 
Grayden said:
@Brown
Wow, that’s interesting! I have to play with it more to understand it, since I still have no idea how I did it the first time.
Just be careful. These systems, including Kia’s, can act up in certain areas. For example, if there are lanes for different speed zones nearby, it might keep changing speeds randomly.
@WattWanderer
I’m in the UK, and the system once set my speed to 80 mph, even though the national limit is 70 mph.
@WattWanderer
Yeah, that happens to me too.
Grayden said:
@Brown
Wow, that’s interesting! I have to play with it more to understand it, since I still have no idea how I did it the first time.
There are so many hidden features in the car that I’m still discovering after 8 months. For example, holding the HDA button changes the cruise setting to a throttle limit. If you set it to 45 mph, the car won’t go faster, but if you push past it, the car resists and keeps the speed. It’s useful for windy roads where you don’t want to accidentally speed up.
@Brown
That’s the speed limiter feature. It’s called ISLA and MSLA. It’s meant to prevent you from speeding without noticing. You can still go over the limit, but it’s harder to.
@Brown
The best use for it is in towns with frequent stops and speed changes. You can set it to the speed limit and just drive without worrying about speeding. For example, in the UK, the speed limit is 30 mph, so you set it to 30 and just drive.
@Brown
The speed limiter is useful for rolling hills too. I use it on a 250 km drive with a lot of hills to save battery. It keeps my speed constant and efficient, even though I need to adjust slightly for uphills and downhills.
Grayden said:
@Brown
Wow, that’s interesting! I have to play with it more to understand it, since I still have no idea how I did it the first time.
I’ve had trouble with this system in Texas, where many highways have high-speed lanes and slower frontage roads. The system sees one speed limit, then another, and keeps changing, even when I’m in the center lane. It’s kind of annoying.
@Brown
I wish Kia would add an offset feature, like +5 mph, so you can adjust the speed limit a little.
It probably means that your car is matching the speed limit, right?