Experienced a scary PCS false trigger...
Racer
Joined: Oct 2002
Posts: 1,488
Likes: 52
From: FL
There are thousands of bridges like this across the country. Asphalt to concrete bridge deck. It's hard to believe that is the cause or there must be thousands of false alarms going on.
Lead Lap
Joined: Jan 2003
Posts: 4,957
Likes: 501
From: Maryland
My ‘16 IS350 has an alarm that tells you to brake but doesn’t tighten up the seatbelts or automatically brake and it goes off all the time on another back road I drive on and there is nothing around but maybe a guardrail that could possibly trigger it. It has never once gone off over the bridge I mentioned or anywhere else I have driven. Who knows?
CL Community Team
Joined: Feb 2007
Posts: 9,312
Likes: 584
From: IL
My car does not have any of the above features, but the IS300 loaner I had last month did and I didn't care for it one bit. There are too many times when making a turn one has to cross over a painted lane line, and then suddenly the steering wheel has a mind of it's own and becomes hard to turn. This can be a hazard when trying to make a faster maneuver, but thankfully I didn't have that come up.
My car can apparently tell an intentional steering into another lane and doesn't 'fight' it, but you get a car produced vibration in the steeering wheel briefly but that only happens if turn signal not on. It's definitely made me use signals more for lane changes, even on deserted roads. 
Thread Starter
Lexus Fanatic
Joined: May 2012
Posts: 68,073
Likes: 3,870
From: Maryland
My car does not have any of the above features, but the IS300 loaner I had last month did and I didn't care for it one bit. There are too many times when making a turn one has to cross over a painted lane line, and then suddenly the steering wheel has a mind of it's own and becomes hard to turn. This can be a hazard when trying to make a faster maneuver, but thankfully I didn't have that come up. I am hoping my next Lexus will have a way to permanently shut off all these nannies. A smart and alert driver can do more good on his/her own, vs. the chances of one of these nannies getting in the way and causing an accident.
Has any studied surfaced showing the rate or % of accidents caused by these? I am sure it does it's share of saving people who are not paying attention, but that aint me and I don't want to carry the burden of irresponsible driver's bad habits.
Has any studied surfaced showing the rate or % of accidents caused by these? I am sure it does it's share of saving people who are not paying attention, but that aint me and I don't want to carry the burden of irresponsible driver's bad habits.
I'll be out that way in the next couple weeks, I'll cross that bridge on 450 and see what happens.
CL Community Team
Joined: Aug 2006
Posts: 12,481
Likes: 198
From: San Francisco, CA
^^ I dont know which of the systems was making the steering wheel hard for you during a turn, but that sounds odd. What speed is this turn? Was cruise control on? Was it a "veer" right or left, or was it an actual 90 degree turn? I dont find any of my lane keeping systems intrusive since they only activate when CC is on. And even then, the lane departure warning only vibrates the steering wheel. At least on the Benz, I think everything is pretty well thought out.
Thread Starter
Lexus Fanatic
Joined: May 2012
Posts: 68,073
Likes: 3,870
From: Maryland
^^ I dont know which of the systems was making the steering wheel hard for you during a turn, but that sounds odd. What speed is this turn? Was cruise control on? Was it a "veer" right or left, or was it an actual 90 degree turn? I dont find any of my lane keeping systems intrusive since they only activate when CC is on. And even then, the lane departure warning only vibrates the steering wheel. At least on the Benz, I think everything is pretty well thought out.
CL Community Team
Joined: Aug 2006
Posts: 12,481
Likes: 198
From: San Francisco, CA
that's interesting. Do you like it that way? I can see the convenience of it, but they would need to calibrate the steering wheel to know if its an intentional or non intentional turn out of a lane. Also, these systems should already be smart enough to know when you take hold of the wheel and back off
Lead Lap
Joined: Jan 2003
Posts: 4,957
Likes: 501
From: Maryland
I like the nannies on my Durango with the exception of one, the backup PCS. It always braked hard backing out of my garage so I turned it off. If it weren’t for that I bet it would be a great system but at least I still have parking sensors and rear cross traffic alerts.
Lead Lap
Joined: Jan 2003
Posts: 4,957
Likes: 501
From: Maryland
It will be interesting to see if it happens. With my old LS I would always try and replicate it when I remembered while driving on that road to see what was triggering it. I would try it with radar cruise control on, off, varying speeds, etc. and I could never get it to trigger the PCS. Of course when I wasn’t paying attention to the system and just normal driving it would trigger randomly around that spot.
Pole Position
Joined: Jan 2004
Posts: 2,705
Likes: 6
From: Florida
LKAs are not that smart really. It can't recognize between emergency sudden turn and slow lane sway which it should be preventing. I really don't see a need for it to activate by forcing your wheel in city driving conditions under 45 where there are a lot of turns and what not. Same thing with stop and go, if you have emergency breaking it will shut down the car once it hits 0mph but it doesn't take into an account that you might have made a sudden turn to avoid an accident or that you might need to make a sudden turn after emergency breaking, those are some 0.7s precious that you don't have anymore. Its also dangerous when you want to make a left turn on intersection. I really don't get it why manufacturers can't utilize navigation and cameras for smarter stop & go applicaiton
Thread Starter
Lexus Fanatic
Joined: May 2012
Posts: 68,073
Likes: 3,870
From: Maryland
I like the nannies on my Durango with the exception of one, the backup PCS. It always braked hard backing out of my garage so I turned it off. If it weren’t for that I bet it would be a great system but at least I still have parking sensors and rear cross traffic alerts.
