Anyone else have bad phantom braking on C-470 in Denver?

[runelind]

Going both east and westbound on C-470 between Quebec and Santa-Fe there are several spots that seem to be bad for phantom braking. Both when approaching exits and overpasses. Wondering if other people see it or if it is a peculiarity of my car.

 

[Ostrichsak]

You should list more details of your car/system as it's a broad range of both hardware and software across the Tesla line. I have no doubt it's not AP1 as phantom braking isn't something prevalent in that particular system but other than that, just guessing.

 

[runelind]

Oh sorry, it is listed in my signature. I have a 2020 P3D-

 

[BoyoChao]

I have noticed this too, it's not just you. It happens consistently on that stretch, just after passing an offramp cruise speed drops to 40mph even with the limit still showing as 65mph. I have done many tests to verify it.

 

[runelind]

Thank you for verifying. It does not appear fixed yet with the "holiday update"

 

[deeprk]

Got my MYLR last month and I was surprised to see the issue still exist in that stretch. When in AP it slows down from 65/75 to 55

 

[trwr39]

Yes, with 100% consistency on eastbound 470. Don't remember the exact exit, but it's somewhere between Broadway and I25. Happens every time.

It's very weird behavior, but it isn't like the other phantom braking events I experience. Rather than a false emergency braking event, the car simply chooses the wrong speed limit, Seems like bad mapping data or the cameras spot a "45mph exit" speed limit sign and interpret it incorrectly.

Either way, it's frustrating, and could be dangerous. There needs to be a reporting mechanism for weird/wrong autopilot behaviors.

 

[Dan Baldwin]

Not C470, but I drive from Boulder to CO Springs once a month on I25, I experience one or two startling episodes of Phantom braking each time. I really haven't paid particular attention to exact location.

 

[wild goose]

Yes, with 100% consistency on eastbound 470. Don't remember the exact exit, but it's somewhere between Broadway and I25. Happens every time.

It's very weird behavior, but it isn't like the other phantom braking events I experience. Rather than a false emergency braking event, the car simply chooses the wrong speed limit, Seems like bad mapping data or the cameras spot a "45mph exit" speed limit sign and interpret it incorrectly.

Either way, it's frustrating, and could be dangerous. There needs to be a reporting mechanism for weird/wrong autopilot behaviors.

We had the the exact same experience last week on 470 in our new model Y. I’m afraid of getting rear ended on one of the slow downs.

 

[BillRadio]

Yes, the 3 predictable spots are still there: westbound at the Wadsworth and Santa Fe exits and eastbound at the Santa Fe exit ramp.

I do not get phantom breaking, I get a cruise control change from 70 to 45, which is equally abrupt. I do not have that problem when I'm in the Express Lane. While you might guess it's reading the 45 mph exit ramp sign, that doesn't happen in areas where the actual speed limit changes. I keep looking for a better explanation.