djinndjinn
Member
- First Name
- Eric
- Joined
- Nov 8, 2025
- Threads
- 2
- Messages
- 13
- Reaction score
- 13
- Location
- Pennsylvania
- Vehicles
- cybertruck, 2026 R1S Dual Max
- Thread starter
- #1
I know there is another thread about where Rivian gets it speed limit information from. And it seems that there are differing opinions. This is more a comment about how inaccurate the speed limit information is that is displayed inside our 2026 Rivian R1S.
For context, we have driven Tesla’s since 2012, so we’re very familiar with what they’re able to do and the limitations, especially when it comes to displaying speed limit signs. And there are definitely errors, but they are few and far between. And on those forums, there are the same debates about how much of the data is coming from database versus visual reading of the signs.
I’m sure someone is going to say “well in my area, every sign is accurate”, but I just wanted to give an example. We drive frequently between Pennsylvania and South Carolina. Our Tesla reads the signs almost 100% correct. On our last trip to South Carolina this past week with our 2026 Rivian R1S, there were over a dozen instances of speed inaccuracies. Major ones – 35 versus 65, 45 versus 70, 55 versus 65 etc. These are officially posted signs, not construction signs. And we’re talking about major highways – Route 81, Route 77, Route 85.
I use hands-free most of the driving, and really enjoy it - often times better than Tesla FSD because it seems to function better in poorer weather (I suspect because of the addition of radar). But I have to remain extremely vigilant about posted speed limit signs, because of how inaccurate the car is. it is a fatiguing activity. Your first clue is contextual, that people are going a different speed than what’s displaying, but I can’t tell if people are going 80 in a 70, or 80 in a 55. It’s actually one of the few complaints we have about the Rivian, which we otherwise love.
Hoping as they continue to focus on autonomy that this is improved to the point where one can say it is reliable. Clearly it’s not now, at least between Pennsylvania, Virginia, Maryland, North Carolina, and South Carolina..
For context, we have driven Tesla’s since 2012, so we’re very familiar with what they’re able to do and the limitations, especially when it comes to displaying speed limit signs. And there are definitely errors, but they are few and far between. And on those forums, there are the same debates about how much of the data is coming from database versus visual reading of the signs.
I’m sure someone is going to say “well in my area, every sign is accurate”, but I just wanted to give an example. We drive frequently between Pennsylvania and South Carolina. Our Tesla reads the signs almost 100% correct. On our last trip to South Carolina this past week with our 2026 Rivian R1S, there were over a dozen instances of speed inaccuracies. Major ones – 35 versus 65, 45 versus 70, 55 versus 65 etc. These are officially posted signs, not construction signs. And we’re talking about major highways – Route 81, Route 77, Route 85.
I use hands-free most of the driving, and really enjoy it - often times better than Tesla FSD because it seems to function better in poorer weather (I suspect because of the addition of radar). But I have to remain extremely vigilant about posted speed limit signs, because of how inaccurate the car is. it is a fatiguing activity. Your first clue is contextual, that people are going a different speed than what’s displaying, but I can’t tell if people are going 80 in a 70, or 80 in a 55. It’s actually one of the few complaints we have about the Rivian, which we otherwise love.
Hoping as they continue to focus on autonomy that this is improved to the point where one can say it is reliable. Clearly it’s not now, at least between Pennsylvania, Virginia, Maryland, North Carolina, and South Carolina..
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