55 mph setting in a 45 mph zone

[Edphonse]

I just got done with a 1300 mile trip and "used" fsd for over 1200 miles of it. By used, I constantly had to flip between profiles stay at or near the speed limit.

There appears to be 2 separate sets of profiles based on the current road.

For the freeway, there are really only 2 profiles, piss everyone off including yourself or reckless driving ticket. In sloth/chill, it REFUSED to maintain a speed even if the limit was right. Chill would swing between +2 to -8 mph from what it thinks was the speed limit(this was in broad day light with good visibilityin all directions). Standard was doing 15 mph over the speed limit (which it knew correctly this time) but no real traffic around.

On the interior streets, chill/sloth acted as above, standard was +5 (unless it had peer pressure by someone tailgating you) and hurry/mad max was somewhere over +5.

The lack of max speed option is even worse for road trips because when you get to that, maintain less than x mph to make it to your destination, you literally can't use fsd because you can't tell it to drive less than that speed. While not common, there are still plenty of stretches in the US that this can be an issue.

Governments fining tesla for "deceptive fsd" need to tell tesla to fix the cruise control portion and give drivers the ability to set their desired speed back. FSD 14 improvements over FSD 13 are completely overshadowed by the ridiculous decision to remove a critical safety feature.

Sponsored

 

[georgek43]

You have provided a summary that so many of us are experiencing. Hopefully it is just a matter of time before Tesla either wises up on their own, rescinds this decision and cans the developers that pushed it, or are forced by regulations and law suits to return max speed control to drivers. It was a horrible, short sighted and dangerous decision to remove it. I am a paying customer. I paid for FSD and want to be able to use it without risking accidents or speeding tickets.

 

[REM]

What the Developers are failing to see is that many many times outside of urban areas there is no surrounding traffic. So no matter the mode, the truck speeds up way beyond the speed limit when the GIS data is wrong, and occasionally right into a speed trap. Telling the officer or the judge that the GIS data is wrong is not likely to be a very good defense.

That's why the onus is still on you to make sure FSD is performing as it should, and if not, disengage.

Where did Tesla promise you perfection?

 

[REM]

Here is a situation where max speed might be a negative. If you have a max speed set 5 miles above the speed limit and was going max speed, changing lanes might be an issue if there is a car in that lane behind couple of car lengths that is going the same speed but clear in front, FSD can’t go over the max speed and slowing down might not work to change lanes.

Spot on! Most people seem to think speed limits are a simple math equation of 2+2 to solve lol. It's definitely a complex dance of many conflicting factors.

 

[georgek43]

Never expect perfection- it was just easier and safer and less stressful to use FSD when I could set the speed. I rarely disengaged before speed profiles, now I am disengaging much more, and using FSD on neighborhood streets much less.

 

[Kamin]

Yep. Apparently sometime between September 2025 and now, those 45 MPH signs were added, but like everything else, our government has failed to update the GIS data. The truck can see the sign, but it ignores it because the GIS data is weighted higher.

I moved to TN in January of 2024 and the highway that is 55mph in TN has always dropped to 45mph as soon as I crossed the border into NC and stays that way until reaching the point the highway is divided and 4 lane which then goes to 55. Using GIS data makes sense of why I keep seeing the truck think the speed limit is different than what it is. Chill goes 2mph above the limit unless road conditions dictate slower. The stretch through the mountains has so many switchbacks that I love having the FSD negotiate all those swerves and it slows appropriately.

 

[Chip Geek]

For me the biggest problem here is that the cameras do not always see the speed limit signs OR just pick a number out of ...um... their tailpipe. Examples: 60MPh in my 25MPh 'hood or 70 MPH in the 40 MPH road nearby.

If Tesla refuses to give back drivers the ability to control the speed, they need to crowd source the correct speed limits. Since they have millions of cars on the road, they should keep track of the limits and spread that info to the fleet in the map data.

Sponsored