Cruise Control
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Driver
Joined: Apr 2024
Posts: 75
Likes: 53
Cruise Control
Any rhyme or reason for the cruise control getting back up to speed - sometimes like a bat out of hell and sometimes so slow people are honking at me?
...just something I have notices that is kind of annoying. Its a small pet peeve... love this car!
...just something I have notices that is kind of annoying. Its a small pet peeve... love this car!
Lexus Test Driver
Joined: Jul 2017
Posts: 9,559
Likes: 3,398
From: NJ
You're referring to radar cruise I presume. It does sometimes behave oddly.
Advanced
Joined: Jan 2008
Posts: 564
Likes: 50
From: CA
yeah that is slightly annoying. Sometimes the bat out of hell style happens when there is a car slowing down in front, then it has to issue the red crash alert and slam on the brakes ! (or I intervene with brakes prior)....
Intermediate
Joined: Dec 2023
Posts: 435
Likes: 158
From: GA
I've learned through trial and error how to somewhat control it so the car doesn't slow quickly. What I can't figure out is how to keep it at speed when going through a sweeping curve and it slows because it detects a car on a side road waiting at a stop sign.
Thread Starter
Driver
Joined: Apr 2024
Posts: 75
Likes: 53
That may not be about the car next to you. The cruise is designed to slow down on curves - its a setting you can change by degrees. Not sure if you can turn it completely off...?
Intermediate
Joined: Sep 2023
Posts: 339
Likes: 166
From: OH
I think he meant that radar saw the parked car and slowed quickly by applying the brakes but I could be wrong. Going around curves and slowing 1 or 2 mph also needs to be defeated. It always reacts at the apex of the curve which is about the time I would normally be preparing to accelerate. It is always late to the party.
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Advanced
Joined: Jan 2008
Posts: 564
Likes: 50
From: CA
One issue is that if it detects a car next you you on a curve, then it will get confused and slow down. Not much one can do about that . However, I have noted that the Tesla Model 3 is even worse with acting on adjacent things that really are not in the way!
Keep in mind another thing. There is a setting you can set that will deliberately slow down your radar cruise speed on curves. If you dont want this to happen, make sure that setting is off. Personally I like that auto, slowing down a bit on curves.
Keep in mind another thing. There is a setting you can set that will deliberately slow down your radar cruise speed on curves. If you dont want this to happen, make sure that setting is off. Personally I like that auto, slowing down a bit on curves.
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Advanced
Joined: Jan 2008
Posts: 564
Likes: 50
From: CA
I think he meant that radar saw the parked car and slowed quickly by applying the brakes but I could be wrong. Going around curves and slowing 1 or 2 mph also needs to be defeated. It always reacts at the apex of the curve which is about the time I would normally be preparing to accelerate. It is always late to the party.
Intermediate
Joined: Dec 2023
Posts: 435
Likes: 158
From: GA
I understand the feature of the car slowing in curves while in cruise control. I like that feature. What I don’t like is exactly what I posted - if you are going through a curve it can detect a car sitting at a stop sign on a side road waiting to get on the same road you are traveling and it slows the car down. Sorry if I wasn’t clear.
Instructor
Joined: Dec 2019
Posts: 1,242
Likes: 624
From: Kentucky
- All-Speed Dynamic Radar Cruise Control (DRCC): This system uses radar to detect vehicles ahead and can adjust speed to maintain a set following distance, even slowing to a stop if necessary. While Lexus doesn't explicitly state it detects vehicles waiting to turn, the radar's ability to detect stopped vehicles implies it likely can.
- Pre-Collision System with Pedestrian Detection (PCS): This system uses radar and cameras to detect vehicles, pedestrians, and bicyclists and can automatically brake to help prevent or mitigate a collision. This confirms the system's ability to detect bicyclists.
- Detect stopped vehicles waiting to turn in a curve.
- Detect bicyclists and initiate braking if necessary.
According to the 2022 Lexus ES 350 owner's manual, the All-Speed Dynamic Radar Cruise Control (DRCC) can:
- Detect vehicles ahead, including stopped vehicles: The system uses millimeter-wave radar to detect vehicles ahead and can maintain a preset following distance. This includes stopped vehicles, even in curves.
- Work in conjunction with the Pre-Collision System (PCS) to detect bicycles (under certain conditions): While the DRCC primarily controls speed based on vehicles ahead, the PCS can detect bicycles under certain conditions and warn the driver or brake automatically, helping to mitigate collisions.
- The 2022 Lexus ES 350's All-Speed Dynamic Radar Cruise Control can detect stopped vehicles waiting to turn in a curve.
- The system, working with the Pre-Collision System, can also detect bicycles and may warn the driver or brake automatically if a collision is imminent.
Scenario 1: Stopped Vehicle Waiting to Turn in a Curve
You're driving your 2022 Lexus ES 350 on a winding coastal highway. You've set your All-Speed Dynamic Cruise Control to 55 mph and are enjoying the scenic views. As you approach a sharp bend, a pickup truck with its turn signal on appears ahead, stopped in the road as it waits for oncoming traffic to clear.
Your ES 350's radar system detects the stationary truck and its position in the lane. The DRCC recognizes that the truck is not simply slowing down but is fully stopped, likely waiting to turn. To ensure your safety and maintain a safe following distance, the DRCC automatically begins to decelerate your vehicle smoothly.
As you round the curve, your ES 350 slows to a crawl, keeping a safe distance behind the stopped truck. The system continues to monitor the truck's movements. Once the truck begins to turn and clear your lane, the DRCC smoothly accelerates your ES 350 back to your set cruising speed of 55 mph.
Scenario 2: Bicyclist in Path
You're using the All-Speed Dynamic Cruise Control on a suburban road with a 35-mph speed limit. As you approach a slight incline, a cyclist wearing a helmet and bright clothing appears ahead, riding in the middle of your lane.
The ES 350's Pre-Collision System with Pedestrian Detection, working in conjunction with the DRCC, recognizes the cyclist as a potential obstacle. The system calculates the cyclist's speed and trajectory and determines that your current speed is too high for safe passing.
To avoid a potential collision, the PCS automatically reduces your speed, providing ample space between your ES 350 and the cyclist. Your car maintains a reduced speed until it's safe to pass the cyclist, at which point the DRCC smoothly accelerates back to your set speed. You overtake the cyclist safely, maintaining a generous distance as you pass.
Lexus Official Response on Scenario:
If a vehicle with All-Speed Dynamic Radar Cruise Control (DRCC) is driving in a curve and there is a vehicle stopped at an intersection waiting to turn, the system is designed to:
- Detect: The radar sensor in the front of the vehicle should detect the stopped vehicle ahead, even if it's partially obscured by the curve.
- Evaluate: The system will assess the situation, including the stopped vehicle's position, speed (which would be zero in this case), and potential trajectory.
- Respond: If the system determines that the stopped vehicle poses a potential hazard, it will automatically slow down your vehicle to maintain a safe following distance. This may involve reducing speed significantly or even coming to a complete stop behind the waiting vehicle.
Lexus does not publicly disclose specific distance measurements for when the DRCC starts to intervene in these scenarios. However, the system is designed to react dynamically based on several factors, including:
- Vehicle speed: The faster you're going, the earlier the system will start to react.
- Distance to the object: The closer you get to the stopped vehicle, the more aggressively the system will intervene.
- Curve radius: The sharper the curve, the more cautious the system will be in its response.
While the DRCC and PCS are sophisticated systems designed to enhance safety, it's crucial to remember that they are driver-assist features, not a substitute for attentive driving. Always be prepared to take control of the vehicle if necessary, especially in challenging driving conditions like curves and intersections.
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