I have noticed the system only works well when it can sense a moving object, like a car. Stationary objects, such as vehicles in stop-and-go situations or a vehicle in front of you waiting at a red light, is hit-and-miss. Most of the time I have to end up breaking manually to ensure it doesn't get too close before slamming the brakes. And like jim256, I use the middle setting. The minimum is too 'dangerous' and the maximum slows down unnecessarily.

 

Cruise control is NOT designed for stop and go traffic.

 

Absolutely TRUE and should be frequently repeated in threads like this. I use the Adaptive CC only on the freeway/highway and find that it works quite well. I still keep my right foot in a position to manually brake if I feel I need to.

 

It's called "Adaptive Cruise Control", "cruise" being the important word there. Stop/start traffic is not what it's designed for.

 

Do I trust it? Hell No!!! My 450h does not have it & I won’t have it. I was given a service loaner that had it. While driving home on a stretch of 6 lane interstate in rolling hills & gentle turns, that system scared the crap out of me. I’m doing at least 70 mph in the far left lane & the speed limit is 75 mph. A semi was moving slowly in the far right lane (2 lanes over from me). We were ascending a gradual hill on a curve & suddenly this *%#+ thing slams on the brakes in the middle of the curve! It was picking up the semi & NOT what was in front of me, which was nothing.

These systems are seriously flawed. I wouldn’t depend on them for any amount of money. They are somewhat of an aid, but not much. We are not close to self driving cars with garbage like this. I cringe at the thought of what that damn car would have done if it had been raining when it slammed on the brakes on that curve!

 

I'm gonna guess the road was curving left which caused your car to "see" the truck in the right lane as being straight ahead?

I have Radar CC in my 17 RX so I guess that's not the same as Adaptive CC you guys are talking about?

 

Yes, the curve was to the left. I have no idea what it’s called by Lexus; I just know I never want it.

 

Its "adaptive cruise" control and it's standard on 2017 and up. You can, however, disable the adaptive mode and make it a standard cruise control (with no auto stopping, auto speed adjustment) by simply holding the button to turn cruise ON until the icon changes. It's then the standard "cruise" control and has no adaptive capabilities.

These instructions, while for 2016 models with adaptive equipped, are valid for all Lexus vehicles.

http://www.whylexus.com/toggling-lex...-lexus-es-350/

 

ALL-SPEED DYNAMIC RADAR CRUISE CONTROL*

This system uses radar and camera technology to help you maintain a preset speed and following distance from the vehicle ahead. Whether at highway speeds or in stop-and-go traffic, the system is designed to detect if you get closer than the preset distance and automatically slow your vehicle—even to a complete stop. If driving at highway speeds and the road ahead clears, your Lexus returns to its preset speed.

i use it all the time, works very well for me, it occasionally disengages leaving stops, i also change the distance depending on circumstances, (with the HUD it is very easy to see when it sees a vehicle, and the following distance)

 

I just watched the latest edition of CR’s Talking Cars, were the subject of all the driver assistance gizmos came up. The car they were discussing was the Subaru, which they have loved all over, in the past. However, it was very clear that all three testers were constantly annoyed by the false readings & intrusions this gear produces. All 3 turned it off! They also cautioned that some folks are going to turn too much stuff off by accident, because one has to dig through several menus just to get to things. What a flipping nightmare! The Subaru was their “golden car” & even that’s jacked now. Sorry, I’m all about gadgets & tech, but NOT when it makes my life more complicated or annoying. I still embrace many old fashioned ideas & driver crash assist equipment is NOT something I can live with.

 

Same thing and works pretty flawlessly in both of our cars. I use it every time I'm on the highway with little to no congestion.

 

I have a 2018 RX350L and experienced my first extended trip on the Interstate highways. The car performed very well except for one thing: the adaptive feature on the cruise control. For those who have not had this frustrating experience - the adaptive feature senses the car ahead of you and forces a deceleration to keep you well back. The deceleration is substantial and occurs about 300 feet or so from the lead vehicle and keeps you at least that far behind the lead vehicle. In fact, it keeps you so far back that another car can get in front of you which can slow you down even further. The sensor may react further back if the lead vehicle is larger, like a semi.
If you are in the right lane you can anticipate your car sensing the car in front of you and you can move into the passing lane. If you are in the passing lane and come close to the car in front of you, the adaptive feature will harshly slow you down. Besides the discomfort and the chance of getting rear ended, the space between you and the lead vehicle is enough to let one or two vehicles from the right lane move into the passing lane in front of you. And you slow down even further.
I am not writing about a crowded highway being in a line of traffic. . I'm writing about a situation where there are only a few cars involved. Picture being in sparse traffic and coming up on a semi and anticipating a smooth move to the passing lane. And boom - your speed goes from 75 to 65 in a nano second
The middle screen on the dash shows that the cruise control is on and when you approach a vehicle the screen will display an image of a car. Problem is, (1) the image is on about two seconds and (2) you have to be looking at the screen at the precise time it displays the icon to see it.
So,may question, can the adaptive feature on the cruse control be disabled? Can it be disabled without effecting the other safety features related to the sensing mechanism.
Appreciate any responses. Maybe other Lexus drivers have experienced this feature.

 

Two things - 1. you can adjust the distance sensor if you wish - I use it with the closest setting to avoid what you experienced or 2. you can engage cruise control without the radar by holding the button in for an extra second or two.

 

You can use it as regular cruise by holding the on button on stalk for about 2 seconds. As far as the follow distance, you can adjust it. I usually have it on the mid setting. Agreed that if someone passes and cuts in it can slow dramatically, but those times you can quickly cancel and resume when clear. I have it on 2 different cars, have used it without any big problems, and find it does work well in most cases.

 

Does it light up the brake lights when it slows down to a complete stop?