yoyofish

I was in a traffic jam today with my adaptive cruise control activated. The car was driving itself around 5-10 miles and enter a super light curve. Instead of turning itself or lane keeping, the car was actually still going straight under low speed and collided with the car on my right T-T. I know it was my fault for not paying attention for that few second, but there was no beeping or warming. The lane assist or centering did not even vibrate work keep it in lane. My car was actually fine because the clear bra pretty much took all the damage.

FastFord

What car did you guys think you were buying? The car does not steer itself. I don't even think the system works at 5-10 mph.

ggebhardt

Sorry but it was not Lexus that failed, it was the driver.

FSportWaxy

I believe the car needs to be going at least 50-60MPH for the adaptive cruise control to stay activated. I would never trust that anyway, this type of technology hasn't been thoroughly tested enough for me to even remotely consider letting my hands off the steering wheel at high speeds (or even low speeds for that matter).

Glad you're OK though! Now you know for next time

offroad200

It's not a self driving car.....

TeKKieNYC

So who has really failed here? Geez. Glad everyone is ok.

mcomer

Pre Collision is a straight ahead system. Lane Keep Assist is a keep straight system.
The OP observation that "Instead of turning itself..." sums up the trouble, the driver
is to steer around curves.

tdjacw

I dont recall reading anything about this car steering itself. Where did you get this info from.

Gibster

From the 2016 manual, page 285, under the Lane Keeping Assist section:

"This function is linked with radar
cruise control and provides the
required assistance by operating the
steering wheel to keep the vehicle in
its current lane."

guxu

From the User Manual,

• Lane departure alert function: Vehicle speed is approximately 32 mph (50 km/h) or more.

Lane centering function

• Width of traffic lane is approximately 8.2 to 13.5 ft. (2.5 to 4.1 m).
• Vehicle is driven on a straight road or around a gentle curve with a radius of more than approximately 656 ft. (200 m).

guxu

And for Pre-Collision,

Pre-collision warning:

• Vehicle speed is approximately 7 mph (10 km/h) or more. (For detecting a pedestrian, vehicle speed is between approximately 7 and 50 mph [10 and 80 km/h].)
• The relative speed between your vehicle and the vehicle or pedestrian ahead is approximately 7 mph (10 km/h) or more.

● Pre-collision brake assist:

• Vehicle speed is approximately 19 mph (30 km/h) or more. (For detecting a pedestrian, vehicle speed is between approximately 19 and 50 mph [30 and 80 km/h].)
• The relative speed between your vehicle and the vehicle or pedestrian ahead is approximately 19 mph (30 km/h) or more.

● Pre-collision braking:

• Vehicle speed is approximately 7 mph (10 km/h) or more. (For detecting a pedestrian, vehicle speed is between approximately 7 and 50 mph [10 and 80 km/h].)
• The relative speed between your vehicle and the vehicle or pedestrian ahead is approximately 7 mph (10 km/h) or more.

sirtiger

My pre-collision absolutely works. I put it on the most sensitive setting. It beeped a quite few times in very tight NYC driving.....10-20 mph. Only once did it slammed the brakes. I suggest everyone try their technology before trusting it.

ggebhardt

Yep, I know mine works. Jerk in front of me slammed on his brakes to make a turn and before I could remove my foot from the gas pedal the ALARM went off, gas pedal went slack, seat belts tightened and full brakes were applied.

It saved me from rear ending him and ruining my nice new 450h

MisterQ

Yes it does. I've used LKA with dynamic cruise control several times, the lane centering function works well (see page 291 in the manual). It does turn by itself and keeps the car in the center of the lane under certain required conditions, you just need to rest your hand(s) on the steering wheel and let it drive, just be alert of all times, especially around curves as you may need to turn the steering wheel (Vehicle is driven on a straight road or around a gentle curve with a radius of more than approximately 656 ft. (200 m).

How fast were you going? It would not alert you if you were driving below 32 mph (you mentioned you were in a traffic Jam, so slower than 32 mph?)

Read the Lane departure alert function on page 291 of the manual:

Gibster

There is a road in my neighborhood that curves to the left with street parking. On occasion the collision avoidance system will display BRAKE as I approach the curve. It appears the system 'sees' the parked cars without 'knowing' the road curves and displays the warning. So far it hasn't applied the brakes, just displays the warning.