First, I'm a little disappointed that radar cruise only works at speeds over 25mph because I was really hoping it would be more useful during rush hour traffic. Perhaps there other 2018ish Lexus models that have a more in-depth Radar Cruise I could retrofit in its place? One that lets it come to a complete stop and begin moving again?

Secondly, as for the safety issue, when cruising along in traffic and speeds get to the point where radar cruise deactivates, it needs to tell you it's deactivated rather than shutting off with absolutely no warning. It's not a matter of not paying attention to the road - because the point of radar cruise control is to not have to keep your foot on the gas or the brake - but when you're depending on your car to keep a set distance from the car in front of you and that car slows down to under 25mph but yours keeps going (coasting) because you don't realize radar cruise has shut off, its quite unnerving, and can easily cause an accident. Has this happened to anyone else?

 

The is only one Dynamic Radar Cruise system available for your vehicle, so there is nothing that can be retrofitted from another year model of your vehicle.

The type of operation and concerns you noted are mentioned in the owners manual.



There is another page in the owners manual that mentions Dynamic Radar Cruise is meant for Freeways and Highways.

Maybe in the future Toyota/Lexus vehicles may get to that threshold of operation you're looking for...which would be more akin to Auto Pilot...which Tesla does have for the Highway, but has only recently introduced for certain city centres, for self driving inside the city.

 

My ex has a 2018 Honda CRV with radar cruise that worked in traffic as well as lane keeping that functions at any speed. Still had to keep your hands on the wheel, but seems far more advanced than what's in my 2018 Lexus, which is a shame.

 

I would agree. At it's core the 2018 IS is just a 2014 IS with some minor cosmetic changes and minor interior improvements.
It could be argued that the 2021 IS is just a 2014 IS with major cosmetic changes and moderate interior improvements.
Perhaps in the next iteration of the IS (maybe 2025/26) we will see a major advancement forward in the vehicle.

You will note that some don't care for the "nanny" features like Lane Keep Assist, so for those folks advancing that technology is pointless, in their eyes.
Personally I'm fine with a more natural driving experience where I'm driving...ABS/TRAC/VSC is all I need or can tolerate.

 

I get hella annoyed with the vibrating on the lane keep or it trying to nudge the wheel aggressively. have to turn it off asap

 

Pretty sure the new Toyotas and Lexus use the same system, they work pretty good on long stretches of road with not too hard of a curve.

But I did notice, when you're driving on a highway with stop lights at speed limit of 55mph and you have the radar on 60mph. The stretch in front of you is empty and the cars are stopped at a red light, would the car stop? I feel like it wouldn't stop in time and slam into the cars at the red light because the car does not slow down at all

 

I am with Sasnuke - I dislike all the nanny stuff - If I want to be in a vehicle that drives itself or where I don't need to be connected with the driving experience, I'll take the bus. The one thing I do like though is the blind spot monitoring, that can be handy. Again, no disrespect to anyone who enjoys or prefers that technology and I wish it could be ordered with/without. Our personal situations are all different but in my case, I much prefer not having/using that stuff.

 

No, it would not stop. It needs a moving object to track.

 

I mostly feel the same way. I don't need - or want - a car that babysits my driving. I want features that make driving less work.

But it's not that I think we should circumvent safety for convenience. It's that we're over-engineering safety for the sake of convenience. Can you imagine having to keep your feet on the pedals when cruise control is active? So why the requirement to keep both hands on the wheel (despite the natural driving position where at least one hand is always on the wheel anyway)? You're still driving, and you know when to assume control, so why is it different?

 

Situations unsuitable for dynamic radar cruise control Do not use dynamic radar cruise control in any of the following situations.

Doing so may result in control of the vehicle being lost and could cause an accident
resulting in death or serious injury.

- In heavy traffic.

http://www.lexomans.com/manguide-476.html

 

Then how does it come to a stop when the vehicle stops in front of you if it needs to be moving

 

Exactly. The tech and systems are already there for Emergency Braking. Why not extend them to Dynamic Cruise?

But, contrary to what others say, there is actually a way to increase the autonomy level of our vehicles. OpenPilot is an aftermarket system that expands on and improves existing/stock LKA and Dynamic Cruise functions. It's not cheap, but (as I suspected) it is entirely possible.

 

Radar cruise control will detect and track a MOVING vehicle. It will NOT detect a stationary object or one that is moving very slowly. Note the first two lines from the owner's manual paragraph attached.

 

Because it was a moving object when the radar detected it, it was able to track it to a stop. But it will not "lock on" to an already stationary vehicle if you are approaching it at speed.

 

i saw that but wasn't sure if it will work for IS gen 3 V1 with only lane assist warning opposite to IS gen 3 V2 with lane assist ( some assistance control)