Mine will slow down if I approach slower traffic, hold the safe distance between us and accelerate back to the set cruise speed once the slower car is no longer in front of me or speeds up. If yours doesn't do this, either you have a defect or you are not activating this feature correctly,
And yes, you still need to DRIVE the car, it's a safety aid, not a self driving system!!!!! Slowing at a traffic light should still be done as you have always done it. Why would you expect ADAPTIVE cruise control to control the car when it comes to traffic, stop lights, and heavily crowed roads?

 

There's a lot of confusion in this thread between when a car stops in front of you and when a car is already stopped and you come upon before your car has a chance to register it as a moving object. Auto Cruise will stop if a car you're following stops. It usually won't stop if a car is already stopped there, like a stationary object (not a car you were following).

This can also be tested a different way. When you're following a car in traffic with auto cruise on but not "set," and it stops and you stop behind it. You can then usually set the cruise while stopped behind it. If you come upon a car that is stopped and stop behind it, it usually won't let you set the cruise while stopped behind it. It just doesn't register it as a moving object yet.

It
Having just driven with Smart Cruise Control I am not convinced it is safe.
For a start, break lights do not come on when the controller slows you down.
Also, there is too much fiddling with buttons and messages( especially when you want to turn the smart feature off and just use basic CC. I would love to turn off the Smart CC permanently.

 

I believe since the car is based on radar it can only detect moving objects. So if the car is stopped when the radar is in range of the car it will not detect it. It has to "lock" onto the car, which it can only do if the car is moving (even 1 mph).

 

You should have a few dashboard options. Smart cruise on/off and acceleration speed should be set to LOW. These are hidden in the many menus.

I have "smart cruise" in my 2016 HSH, almost two years now. Love it. Yes, it should "slow" when it sees a car in your lane slower then you are going. It should not "brake hard" at all. It WILL detect a stopped car in front of you (example: at a stop light) but I always hit the brake at those situations. Obviously some people don't have smart cruise or whatever they call it <<< So if the car is stopped when the radar is in range of the car it will not detect it. It has to "lock" onto the car >>>

That would kind of make it useless...

It does work in the rain.. .but again be cautious in the rain. If you change lanes and the tire hydroplanes, it will try to accelerate to maintain speed. So turn it off if if shifting lanes in the rain. There are bugs like: setting the smart cruise, changing to the "slow lane" at a slower speed then your set speed and you turn to the exit lane. The smart cruise will accelerate to your set speed when on the ramp if no one is in front of you. Only did that once...
Another bug: driving and after a bit noticing everyone is passing you. Your smart cruise has slowed you to the car in front of you without you noticing.
Another bug: your smart cruise is set and the car in front of you starts to go off a ramp. The radar senses the car and you SLOW to his exiting speed even though the car is no longer in front of your. Again, you need to "cancel" the cruise until you pass the car on the ramp, then turn it on again.

There is a way to turn of "smart cruise" via the dashboard. Then it reacts like any cruise... keeps going at set speed into the car in front of you ! My wife's car is a Santa Fe Sport, with regular cruise... it is very easy for me to react differently in her car as I am way up in the air with her car and know what to do differently.

 

1. same on mine, it looks for moving objects, but sometimes it will pick up on stopped objects. once it picks up on a moving object and follows it though, it will stop if that object stops.
common thing, i've learned to watch for. for example, tesla auto pilot: https://www.youtube.com/watch?time_continue=50&v=2WjMcUhsMAM

2. there's an option on dashboard under settings to set it to 3 different settings. i think i have mine on the medium or slow setting. when i got the car it was on the aggressive setting and it wasn't slowing down early enough for my liking.

 

Aren't those setting for the cruise acceleration speed ?

 

Directly or indirectly it also affects how early it starts to brake. The sensation is that when it's set to aggressive it keeps accelerating till the last possible second, then abruptly hits the brakes.

 

Detecting a stopped vehicle is inconsistent. Most of the time it doesn't detect so I expect to have to brake.

 

This is how mine behaves. Stressful when travelling in city traffic at 80 KMH
(about 50 MPH) and approaching a stopped vehicle at that speed when it
gives no indication it will stop.
Not a big deal for me, as I usually drive for max fuel economy - looking ahead
and seeing a stop coming up I will press cancel on the cruise control and just
glide to the stop or hit resume if the light changes.

Also interesting when following a car which changes lanes and a stopped car
is shortly ahead of me - cruise control accelerates to set speed, giving no indication of stopping.

As others have said, its a driving aid, not a replacement for attention & intelligence. I use it a lot in city traffic, but its not suitable (or relaxing)
for all driving conditions

 

If your car is not detecting a stopped car, it is not working right.

<<What is Smart Cruise Control?
Smart Cruise Control is an active safety technology that enables equipped Hyundai models to automatically maintain a driver-selected distance from any vehicle that is ahead in the same lane. Like a conventional cruise control system, Smart Cruise Control is able to keep a Hyundai at a specified highway speed without the need for continuous driver pressure on the accelerator. Unlike conventional cruise control, however, Smart Cruise Control is able to sense when any preceding vehicles have slowed down or stopped and, in response, adjust the Hyundai's speed to keep a safe distance. When equipped with Stop and Go, Smart Cruise Control can even put the Hyundai back in motion after it has stopped.>>>

My 2016 HSH will stop and a dashboard warning stating "you need to press the gas to accelerate. I do not have Stop and Go.

 

You have stop and go, Hyundai just programmed the system so that if you're stopped longer than 3sec(?) it will require input from you to resume moving.

 

2018 Sonata driver, mine stops and starts at lights when the vehicle in front of me stops and restarts. I never have to touch the brake or the gas pedal. It does it all on its own. I am still a bit cautious and stay ready to stop just in case something goes wrong.

 

Hyundai added that to the 2018. Stop and Go... I guess if you drive in lots of traffic it would be great.

 

Full stop adaptive cruise was added in the 2015 model year.

 

Right.. but not the GO, my 2016 Ultimate states on the dash you must press the accelerator to go. The smart cruise before 2018 only stops you.

 

My 2016 Ultimate has stopped and started without input many times but, like I said before, if you're stopped for too long then the system requires your input to resume travel. It sounds like on the 2018's they increased the stop time before it will require your input, possibly indefinitely.

 

According to a YouTube video for 2016 if the car stops, the center dash states you must press the Acc/Dec button to start the car moving again. That's what mine did but I did not read the message when I tried it. I just hit the gas.
So kind of Stop - Go.

In heavy traffic, this must be great. I usually never hit that traffic.

 

I have stop and go every day of my afternoon commute. My 2016 SCC makes that much less stressful. After 3 sec's I have to flick the switch or tap the accel. No big deal. the Auto Stop is the most important..

 

My 2018 with SCC appears to function the same as yours. The image is from the owners manual.

 

There's a lot of confusion in this thread between when a car stops in front of you and when a car is already stopped and you come upon before your car has a chance to register it as a moving object. Auto Cruise will stop if a car you're following stops. It usually won't stop if a car is already stopped there, like a stationary object (not a car you were following).

This can also be tested a different way. When you're following a car in traffic with auto cruise on but not "set," and it stops and you stop behind it. You can then usually set the cruise while stopped behind it. If you come upon a car that is stopped and stop behind it, it usually won't let you set the cruise while stopped behind it. It just doesn't register it as a moving object yet.

 

I can only say what my Smart Cruise Control does in my 2016 HSH. I can change my acceleration when the cruise is set and nothing is in front of the car. I have it set to LOW, and 90 percent of the time it only accelerates moderate. That is 40% power on the meter I have on my dash.

I have owned this for almost 2 years and it ALWAYS senses stopped cars. The item that might change that, is the distance setting (1, 2, 3 or 4 bars) I always turn it to 2 bars distance. Even at that setting, some 100 feet I can feel the car slowing at any stopped car. I just hit the brakes anyway. The radar is just sending out a signal and determining how far the object is. I also have collision avoidance. Basically just beeps and a dashboard display if you do not have cruise on and you are accelerating to a stopped object. The collision avoidance, when the cruise is on, is the computer braking the car.

The smart cruise does strange things, like accelerate to a stopped (or very slow moving) car, but far away from me. But when it gets close, then you feel the braking.
If you believe that Hyundai is that stupid that the car will slam into a stopped car with the smart cruise on... go ahead . . believe what you wish.
I have had multiple interactions with the smart cruise, it stops (or starts to stop) the car. If you set your distance to 1 and love to tailgate, your choice.