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AP doesn't use right front sensor?

mspohr

Well-Known Member
Jul 27, 2014
10,068
12,655
California
When I'm on the freeway using AP, the car does a good job of staying right in the middle of the lane. This is good most of the time. However, occasionally there will be a person to my right who is drifting towards me or is just driving at the left edge of their lane. Sometimes they are quite close. I notice that the right rear sensor shows them with a white or yellow mark on the dashboard (after I have passed them) but I never see an indication from the right front sensor even though the car is the same distance away on the front and rear.
It would be great if the front sensor worked to sense a vehicle in the right lane and would move my car over towards the left of my lane, away from the car I'm passing.
 

ddimit

Member
I have noticed this as well. I was going to ask the SC next time I was in. I have had a couple of close calls with semi's wandering over the line and the front sensor doesnt catch it until you get a collision alarm. The back sensor already reads farther out. I wonder if this is a design or a bug
 

Max*

Charging
Apr 8, 2015
6,672
3,835
NoVa
Slight correction to your theory: AP doesn't display the car that it likely sees from the right front center on the blind sport warning system.

I agree with [my] above statement. It's rare that I get the semi-circle in front, but I get it in the rear very often. The reason I believe it does this is that the front area is not a blind spot, you see what's there. The rear area is a blind spot, so they show those more.

I think it's fully able to detect it, I just don't think they're showing it all the time.
 

mspohr

Well-Known Member
Jul 27, 2014
10,068
12,655
California
Slight correction to your theory: AP doesn't display the car that it likely sees from the right front center on the blind sport warning system.

I agree with [my] above statement. It's rare that I get the semi-circle in front, but I get it in the rear very often. The reason I believe it does this is that the front area is not a blind spot, you see what's there. The rear area is a blind spot, so they show those more.

I think it's fully able to detect it, I just don't think they're showing it all the time.
I'm sure the sensor is working since it displays semi-circles when I'm parking but I wonder why the AP doesn't use this information to move away from cars traveling too close in the next lane.
 

Max*

Charging
Apr 8, 2015
6,672
3,835
NoVa
I'm sure the sensor is working since it displays semi-circles when I'm parking but I wonder why the AP doesn't use this information to move away from cars traveling too close in the next lane.

Because it's still beta?

Serious answer: I think it does this to some extent, I'm not sure what conditions are required to trigger it.

When I was in a tunnel the other day, AP sensed the wall on my left side, and pushed me closer to the lane divider (instead of keeping me centered in my lane) until I got out of the tunnel. I sort of wish it did NOT do this.
 

DPDsModelS

Member
Sep 24, 2014
87
11
NY
Because it's still beta?

Serious answer: I think it does this to some extent, I'm not sure what conditions are required to trigger it.

When I was in a tunnel the other day, AP sensed the wall on my left side, and pushed me closer to the lane divider (instead of keeping me centered in my lane) until I got out of the tunnel. I sort of wish it did NOT do this.

I've been meaning to start this thread and have been trying to get a decent video to demonstrate!

I think the right front sensor (& maybe the left front too, I'm not sure) may be pointed downward to pick up the curb for parking. The result is the very uneasy sensation you get when the car you are passing to the right of you gets up real close! I'll post my very amateurish videos shortly...
 
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Max*

Charging
Apr 8, 2015
6,672
3,835
NoVa
I've been meaning to start this thread and have been trying to get a decent video to demonstrate!

I think the right front sensor (& maybe the left front too, I'm not sure) may be pointed downward to pick up the curb for parking. The result is the very uneasy sensation you get when the car you are passing to the right of you gets up real close! I'll post my very amateurish videos shortly...

I do agree that the phenomena exists, but I don't think this is the reason (I've been wrong many times). I think it's a software issue, not a hardware problem for two reasons:

1. Why only angle the front sensors, but not the rear?

2. The sonar sensors can detect objects 16 feet away, correct?
Typical lane width is 12feet. (some are 10 feet, but let's use 12 feet to your advantage)
The average car is about 6 feet wide.
Consider a case where the Model S is dead center, and the car in the adjacent lane is encroaching on the lane divider.
That would leave 3 feet of space between you and him in an average lane. For the sonar sensors to not detect 3 feet of space, they would need to be pointed down at an angle greater than 79 degrees from horizontal. That would mean it would pretty much have to be pointing near perfectly down at the ground for them to miss the car [almost vertically]. I find that HIGHLY unlikely.
 
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RDoc

S85D
Aug 24, 2012
2,755
1,706
Boston North Shore
When I back into my garage, the front left sensor shows a tree to the side as I pass it about 6 feet away, but doesn't show the edge of the garage door about 1 foot away which would be a lot more useful.
 

tstafford

Active Member
Jul 4, 2015
1,039
257
Nashville, TN
It definitely happens. But I think it's because we are so used to subconsciously drifting slightly away from people as we pass them that we are conditioned to that. The car doesn't mimic that behavior so it seems (and is) closer than a human driver.
 

DPDsModelS

Member
Sep 24, 2014
87
11
NY
I think it's a software issue,

I hope you are correct so it can be addressed in future software updates. This issue makes it impossible to use auto-pilot when my wife is in the passenger seat because it leads to bleeding ear drums on my right side.:eek:
 

Max*

Charging
Apr 8, 2015
6,672
3,835
NoVa
I hope you are correct so it can be addressed in future software updates. This issue makes it impossible to use auto-pilot when my wife is in the passenger seat because it leads to bleeding ear drums on my right side.:eek:

I'm in NYC today, and as I'm driving down these much narrower side streets, the front sensor keeps going off on every parked car.

I still think it's a software issue, mainly that the front sensor isn't a "blind spot"; but maybe for whatever reason the front sensor can't keep up at speed?
 

Max*

Charging
Apr 8, 2015
6,672
3,835
NoVa
So I've been watching the front sensors carefully after this thread. I've noticed two things
1. Going above about 35mph the front sensors don't light up. Below roughly that speed, they easily detect cars on both front and rear
2. Unless you're next to an 18 wheeler, then you could be going 70mph and they'll see it.

I'm still leaning towards software"feature"to not distract you, since the front isn't a blind spot.
 

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