In Michigan "In Michigan, the speed limit on unmarked roads is 25 mph in residential areas and 55 mph on trunk line and county highways. However, on other roads, if there is no properly posted speed limit sign, the “basic speed law” applies which requires a careful, prudent, reasonable and proper speed." HOWEVER my Model 3 will only go 45 mph on the surface streets if it doesn't know the speed limit. Sigh, it annoys others on the road and I normally turn AP off if there is someone behind me. Does anyone know if V9 FSD knows default speed limits in states or will it still limit speed to 45? FSD pretty much useless on surface streets outside of city if so. And if there is no end of limit sign the car will eventually slow down if a long way from the last 55 speed limit sign.
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Limits speed to 45 mph when unknown speed limit
- Thread starter tigerrr
- Start date
TresLA
Member
I’m in California. I don‘t have FSD beta, but do have normal AP & purchased “FSD capability” included features. I engage AP most everywhere I can.
I have never noticed a 45 MPH limit, but then again maybe the speed limit is known (navigation data) for all the roads I activate AP on.
It doesn’t allow you to up the set speed past 45 on those streets?
I have never noticed a 45 MPH limit, but then again maybe the speed limit is known (navigation data) for all the roads I activate AP on.
It doesn’t allow you to up the set speed past 45 on those streets?
True Max speed for AP is not allowed above 45 on those streets / (lane keeping and speed control & stop sign/light features and not in the beta program). I thought maybe Tesla doesn't know how much a problem that is because, you know, California and city is most of their experience/testing/market?
TresLA
Member
Perhaps people reporting speed limit issues helps? Not sure, as I know driving near Tesla HQ there is a freeway exit ramp that NoAP still takes way too fast (I wait until the last moment before taking over just to see if they've fixed it). There are also still plenty of roads in Southern and Northern California with the wrong speed limit for at least a stretch, where I have to press the accelerator or spin the scroll wheel down to reduce the speed. Anyhow, point being the Navigation data isn't complete and speed limit signs aren't always visible in time.
EVRider-FL
Active Member
The 45mph limit is documented in the manual:
In situations where the speed limit cannot be detected when Autosteer is engaged, Autosteer reduces your driving speed and limits the set cruising speed to 45 mph (70 km/h). Although you can manually accelerate to exceed the limited speed, Model 3 may not brake for detected obstacles. Autosteer slows down to the limited speed when you release the accelerator pedal. When you leave the road, or disengage Autosteer by using the steering wheel, you can increase your set speed again, if desired.
In situations where the speed limit cannot be detected when Autosteer is engaged, Autosteer reduces your driving speed and limits the set cruising speed to 45 mph (70 km/h). Although you can manually accelerate to exceed the limited speed, Model 3 may not brake for detected obstacles. Autosteer slows down to the limited speed when you release the accelerator pedal. When you leave the road, or disengage Autosteer by using the steering wheel, you can increase your set speed again, if desired.
We have the same speed limit rules in Wisconsin. I would say that the car doesn’t know the speed limit, or thinks it does and it is incorrect on at least a third of the rural highways. It will set the speed at 35 miles/hr for long (10 - 20 miles) stretches, where the road is straight and has a 55 mph unposted limit. This isn’t just one location - many. In a couple cases it had been correct, and the last nav map update made it worse. There appears to be no recourse. Tesla really needs to pay attention to a method to fix this, or it is a hard feature to recommend. Let the driver override the nonsense map data.
Key word is while on Autosteer. This isn't being applied to ACC right? Currently autosteer is limited to +5mph of posted limit in certain areas I've noticed...yet some things, like HWY, it will go up to 85 mph limit set. Haven't personally been on an unmarked road that wasn't under county/city control that proper speed signs aren't in place it is using to determine the speed +5 on autosteer. How it applies ACC I would be curious to see video.
Do you have an example/video of it doing this un an unmarked speed portion of a road where it won't go above 45mph? Since it is recording the last hour of all driving, this should be easy to get and chop down to a short video.
Thx
Do you have an example/video of it doing this un an unmarked speed portion of a road where it won't go above 45mph? Since it is recording the last hour of all driving, this should be easy to get and chop down to a short video.
Thx
^Replying to above, I happened to go down a road today of all things per TS, no posted limit. So I tested the 45mph cruise control/ACC/Autopilot, sure enough, it limits it to 45mph.
That should not be a thing.
Aren't there in some places in Montana and around the Country where there are no speed limits on highways...wouldn't that mean you would be stuck at 45mph on Autopilot then?
Yeah...the road was narrow and twisty, so fine and I wouldn't have used Autopilot anyway in this scenario...but it is limited for sure.
That should not be a thing.
Aren't there in some places in Montana and around the Country where there are no speed limits on highways...wouldn't that mean you would be stuck at 45mph on Autopilot then?
Yeah...the road was narrow and twisty, so fine and I wouldn't have used Autopilot anyway in this scenario...but it is limited for sure.
Knightshade
Well-Known Member
The manual explicitly tells you autosteer is not intended to be used at all on those roads.
And then tells you if you insist on doing it anyway, you get to deal with the speed limitations documented in the manual.
Nope.
Also this doesn't apply to actual limited access/divided highways. On those you can go any speed you want on Autosteer up to the max the system can handle, which is 90, no matter what the speed limit is.
Because those are the roads AS is currently intended for use on.
Wingsy
Member
Man, if everyone went along with that Tesla would have zero data for secondary roads.
Knightshade
Well-Known Member
Of course they would.
Data collection doesn't require AP be engaged.
It doesn't even require the car to have AP (remember even basic AP was optional until early 2019).
The cameras and computer collect data and execute campaigns just fine in 100% manual drive mode too.
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