How well does the “lane keep assist” feature work
#16
Hi NX450h. Glad you’re making progress in your quest to normalize your NX. Wish I could say the same for my NX450h. Lexus corporate has made arrangements for my vehicle to be dropped off at the local dealership for an unspecified time frame. Getting things to work has been a new career position for me. Frankly, I need the relief. Going from one screen to another is often times a 10 minute process. I’ve discarded my profile and solely use the guest mode thru the wired USB connection. Sometimes works. I feel like celebrating when my iPhone 13 Pro phone actually integrates.
About my NX…..rock solid, almighty on the road. Not a single rattle, vibration, odd sound. Drives wonderfully….and it’s power is strong and seamless and linear. The seating position (and seat comfort) is perfect for me. Not a fan of the run flats…and I’m thinking the ride on freeways could be a little less choppy. My NX450h is NOT the F-Sport version.
That’s my update. Hoping the dash does not have to be dismantled today…and that this is strictly a software issue.
About my NX…..rock solid, almighty on the road. Not a single rattle, vibration, odd sound. Drives wonderfully….and it’s power is strong and seamless and linear. The seating position (and seat comfort) is perfect for me. Not a fan of the run flats…and I’m thinking the ride on freeways could be a little less choppy. My NX450h is NOT the F-Sport version.
That’s my update. Hoping the dash does not have to be dismantled today…and that this is strictly a software issue.
#17
Can you explain how to turn on cruise control without setting a speed? I’m trying to do exactly what you describe on my new NX.
adb04 added a point that deserves a highlight. The Adaptive Speed Control and the Lane Trace work
together and and work better together than individually. The LTA can be left on but if you get into a habit
of turning on the Cruise Control even if you do not actually set a speed it will improve the LTA performance.
together and and work better together than individually. The LTA can be left on but if you get into a habit
of turning on the Cruise Control even if you do not actually set a speed it will improve the LTA performance.
#18
#19
Driver School Candidate
Strange, in my 2024 350h when I press the steering wheel button to turn on the cruise, it automatically sets the speed to my current speed. I haven't been able to find a way to enable it without it setting the speed.
#20
Racer
Any I've even more confused about the comment that messing with this stuff somehow changes how well LTA works. LTA is a sub-function of the adaptive cruise, its either on or off when cruise is enabled and works pretty consistently when on (consistently in that it does some things well, other things ok, and some things not so ok consistently according to the conditions. Anyone that has used LTA a lot quickly gets used to conditions that LTA doesn't handle gracefully).
#21
I tried mine once, happened to be at night. It bounced side line to side line twice, gave an error message, and kicked off. Tried again, same thing, never used it again. Useless advertising gimmick on mine.
#22
That's interesting. Mine does very well and stays in the middle. Never bounces around like the previous gen NX.
#23
Driver School Candidate
My experience is the exact opposite... I was actually very pleasantly surprised just how well it works. I use it all the time.
#24
Intermediate
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lsft (06-22-24)
#25
Intermediate
Let's establish some framework here on how lane trace assist works.
The car uses cameras to find / locate lane markings and in optimum conditions of lighting it will actually see the edge of the asphalt even if a side line doesn't exist. As any seasoned driver will admit, painted lines on roadways of all kinds, side roads located in the countryside - single lane either way, multilane highways etc all have various conditions of their painted markings. The car tries to 'see' either a line and or the edge of the road. Any variance from said 'solid or dotted' line creates a either minor or major reaction with the steering. The car is always attempting to 'centre' your car in your lane. When the painted line disappears it needs to figure out if your lane's width has grown larger, you may be at an exit or on-ramp of highway where lines stop, you may have wandered over the line and it's now under the car etc. There's a tremendous amount of analysis going on, and to accept that it will always understand where your car is situated on the roadway should be taken with caution. Add into the mix pylons dotting along the roadway to 'move' you off the designated lane due to construction is another concern too.
On the NX you can adjust settings on how it alerts you either with steering vibrating, or steer correction and an audible alert.
I'm in Ontario Canada and we have some terrible roadways, our lines are repainted annually as they disappear with all the salt and sand we use in the winter. I find my NX350h does an exceptional job with LTA as long as it has something it can see to keep me in my lane. The only other condititon that it doesn't like is strong side winds where the car struggles to keep it's lane, the system will eventually shut off if the winds persist.
Always assume some caution when LTA is enabled and be prepared to correct manually if needed.
Both smart and manual (dumb) cruise control exist on the NX. When you switch to manual it's just an old fashioned cruise, you set speed and it doesn't look for anyone in front of you, it will go constant speed no matter what, until an impending crash is detected then it will alert you and hammer on the brakes.
I encourage you to read your manual starting on pg 484 section 6-2. Using the safe driving support functions . dynamic radar cruise control . to understand all of the various details on how to control and set it up safely. It is primarily a radar based cruise control system and no Lexus doesn't have anything in place like a de-icing heating element on the 'L' emblem on the front grill where the radar sensor is located. So, if snow or dirt or a tremendous amount of road grime or bug guts are covering this location it doesn't work. It also uses those little round sensors outlined in several locations on your front bumper and on bottom of your side mirrors. If they get covered in something the system won't work until it's cleaned. Very heavy rainfall and snow will usually lead to the system not working and shutting down.
When weather conditions are ideal it works great! I use it regularly especially in highway traffic scenarios. Set your speed activate lane keep assist as well, just keep an eye on the road and hands on the wheel and it works well. Take your hands off the wheel for more than 15 seconds or so and it will begin to warn you, don't put a hand back on the wheel and it will begin to slow down the car. If traffic in front of you slows it keeps it's distance with the car in front, which you can adjust this distance (read manual how to do it). Come to a stop for more than 5 seconds i beleive and you just need to tap the gas pedal to have car start back up and follow car in front. Car in front brakes - your car brakes - speeds up - yours speeds up. Very abrupt stop - your car hammers on brakes too. I've tried this out enough times and so far, with my foot hovering over the brake pedal, it manages to stop before a collision.
The car uses cameras to find / locate lane markings and in optimum conditions of lighting it will actually see the edge of the asphalt even if a side line doesn't exist. As any seasoned driver will admit, painted lines on roadways of all kinds, side roads located in the countryside - single lane either way, multilane highways etc all have various conditions of their painted markings. The car tries to 'see' either a line and or the edge of the road. Any variance from said 'solid or dotted' line creates a either minor or major reaction with the steering. The car is always attempting to 'centre' your car in your lane. When the painted line disappears it needs to figure out if your lane's width has grown larger, you may be at an exit or on-ramp of highway where lines stop, you may have wandered over the line and it's now under the car etc. There's a tremendous amount of analysis going on, and to accept that it will always understand where your car is situated on the roadway should be taken with caution. Add into the mix pylons dotting along the roadway to 'move' you off the designated lane due to construction is another concern too.
On the NX you can adjust settings on how it alerts you either with steering vibrating, or steer correction and an audible alert.
I'm in Ontario Canada and we have some terrible roadways, our lines are repainted annually as they disappear with all the salt and sand we use in the winter. I find my NX350h does an exceptional job with LTA as long as it has something it can see to keep me in my lane. The only other condititon that it doesn't like is strong side winds where the car struggles to keep it's lane, the system will eventually shut off if the winds persist.
Always assume some caution when LTA is enabled and be prepared to correct manually if needed.
Both smart and manual (dumb) cruise control exist on the NX. When you switch to manual it's just an old fashioned cruise, you set speed and it doesn't look for anyone in front of you, it will go constant speed no matter what, until an impending crash is detected then it will alert you and hammer on the brakes.
I encourage you to read your manual starting on pg 484 section 6-2. Using the safe driving support functions . dynamic radar cruise control . to understand all of the various details on how to control and set it up safely. It is primarily a radar based cruise control system and no Lexus doesn't have anything in place like a de-icing heating element on the 'L' emblem on the front grill where the radar sensor is located. So, if snow or dirt or a tremendous amount of road grime or bug guts are covering this location it doesn't work. It also uses those little round sensors outlined in several locations on your front bumper and on bottom of your side mirrors. If they get covered in something the system won't work until it's cleaned. Very heavy rainfall and snow will usually lead to the system not working and shutting down.
When weather conditions are ideal it works great! I use it regularly especially in highway traffic scenarios. Set your speed activate lane keep assist as well, just keep an eye on the road and hands on the wheel and it works well. Take your hands off the wheel for more than 15 seconds or so and it will begin to warn you, don't put a hand back on the wheel and it will begin to slow down the car. If traffic in front of you slows it keeps it's distance with the car in front, which you can adjust this distance (read manual how to do it). Come to a stop for more than 5 seconds i beleive and you just need to tap the gas pedal to have car start back up and follow car in front. Car in front brakes - your car brakes - speeds up - yours speeds up. Very abrupt stop - your car hammers on brakes too. I've tried this out enough times and so far, with my foot hovering over the brake pedal, it manages to stop before a collision.
#26
Well with everybody loving it, I went out and tried it again yesterday, and got it to work decent. I don't understand "impending lane assist end, prepare to take over" message, then it clears and continues on. Our lines are decent, but the only thing I could see wrong is rolling hills in a rural setting. We do have an s curve at a township line that did present a stiff, fighting wheel, because I know how to go thru it and the camera couldn't see over the hill. I would want to be more rightish, but on a 3 lane divided xway, I can see centered. It works fine in good situations. Might be interesting to see if overcorrection happens fighting the wheel on evasive maneuvers on the xway tho. Certainly doesn't bounce side to side as new, maybe the camera/computer has to learn the car some?
#27
Racer
Well with everybody loving it, I went out and tried it again yesterday, and got it to work decent. I don't understand "impending lane assist end, prepare to take over" message, then it clears and continues on. Our lines are decent, but the only thing I could see wrong is rolling hills in a rural setting. We do have an s curve at a township line that did present a stiff, fighting wheel, because I know how to go thru it and the camera couldn't see over the hill. I would want to be more rightish, but on a 3 lane divided xway, I can see centered. It works fine in good situations. Might be interesting to see if overcorrection happens fighting the wheel on evasive maneuvers on the xway tho. Certainly doesn't bounce side to side as new, maybe the camera/computer has to learn the car some?
The resistance in the steering wheel when its doing something you don't want can always be overpowered. This does tend to be more noticeable on curves. Some people might be a bit afraid to fight it, but you can and its designed to allow it. The driver is still boss, show it!
And yea, its certainly not the best for twisty country roads. Best used on highways or mellow country roads, although it typically does well with most very well marked roads. Anytime the road markings are lacking, or complex intersections, or just messed up (like in construction zones), it can get confused and wander. The system is supposed to be able to deal with lack of lane markings in some situations (like if there is a car in front of you, it may attempt to follow that car - potentially right into the ditch if they do). Rainy roads can sometimes add challenge because tires marks on wet roads can sometimes fool the system into thinking they are lane markings instead of simple tire markings. I had a Subaru with EyeSight that tried to jerk me out of the lane one time on a wet highway for that reason, my NX did that to me once as well, it wasn't as bad, more like an unwelcome wandering out of the lane. Its these rare missteps that are probably the worst because you might get lulled into a false sense of calm and then out of the blue...
The best way to use such a system is to fully understand it and practice (but never completely trusting).
#28
Intermediate
For all recent - new NX owners, here's a great couple of youtube videos to watch and learn all your features and how they work. This is extremely detailed and time stamped so you can go to the exact spot in videos to see how the various features work. It's from Northside Lexus in Houston Texas, the host is very detailed, she does a great job!
Deep Dive Part 1.
Deep Dive Part 2. At time stamp around 1:37:53 she talks about LTA.
Deep Dive Part 1.
Deep Dive Part 2. At time stamp around 1:37:53 she talks about LTA.
#29
I think people are getting Confused with 2 Lane Keep/Trace Assists
1 don't require cruise control and if you switch lane intentionally or unintentionally without signal, it pulls you back in and you can feel the force from the steering wheel.
2 on with cruise control and will make gentle micro adjustments based on the lane.
1 don't require cruise control and if you switch lane intentionally or unintentionally without signal, it pulls you back in and you can feel the force from the steering wheel.
2 on with cruise control and will make gentle micro adjustments based on the lane.
#30
Racer
I think people are getting Confused with 2 Lane Keep/Trace Assists
1 don't require cruise control and if you switch lane intentionally or unintentionally without signal, it pulls you back in and you can feel the force from the steering wheel.
2 on with cruise control and will make gentle micro adjustments based on the lane.
1 don't require cruise control and if you switch lane intentionally or unintentionally without signal, it pulls you back in and you can feel the force from the steering wheel.
2 on with cruise control and will make gentle micro adjustments based on the lane.