this post was submitted on 18 Oct 2025
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"that breaks speed limits" can be ok.
I have seen a number of US interstates posted at 55mph, when traffic moves at 70-80mph. Being stuck at 55mph on those interstates is dangerous.
The fact that this FSD mode comes with “more frequent lane changes” means it isn’t just keeping up with traffic. It’s designed to go faster than traffic. Stop making herr Elon’s points for him.
I do aknowledge that's always going to be the problem when we have the human + AI driver combinations.
Safest hypothetical is 100% AIs that always follow the same rules... next safest is humans that break the rules, but in a context aware situation (IE everyone going 70 in a 55, is safer than 1 car going 55 and all other cars going 70).
Real danger though is if the AI doesn't make good judgement calls when doing so. IE rather than deciding based on how fast other cars are going, it's primary determination is whether the user says they are in a hurry, leading it to sometimes be the one car going 55, but if the person is in a hurry it may be the only car going 70 on a road everyone else is going 55.
It’s not speed that kills. It’s acceleration. Everyone doing 70 means nobody is an obstacle. But one person doing 55 in that situation is effectively a rolling road block. Even if they’re not hit by someone else they’ll cause accidents as people change lanes to get around them.
“It’s not the speed that kills”
Yes it is. It’s the speed and the weight.
The impact force doubles from 55 to 70. That’s a spectacular difference. Driving cars is already the most dangerous thing we do and this talk about if computers make good judgment calls or not? They make better judgment calls than humans every time.
Just because people want to speed on the road doesn’t mean we need to accept the crazy idea that it’s somehow safe for them.
The evidence is very clear that speed kills. You are spreading misinformation.
A car doing 70 will not hit another car also doing 70.
Whether they hit something else is a different situation.
But a car doing 55 in traffic doing 70 is a -15mph roadblock that will either be hit by someone else or cause an accident as people change lanes to get around it.
Unless you’re able to stop everyone from speeding it’s going to be this way.
Y’all got any of them
on/off ramps
I hear this argument a lot and I’m not disagreeing per se. But we should be clear. It can be dangerous for 1 out of 10 cars to be driving 55 instead of 75. But it would be safer by far if all 10 cars drove 55.
It can depend on your locale. I live in a country where outside of highways, posted speed limits are a joke. The cops would probably honk you if you were going the posted limit on a non highway road.
They're at that level for a reason. The problem is that most people are ignorant or give little consideration to human life.
Thank you for explaining my country's specific traffic situation to me.
it’s not just a matter of safety, efficiency also plummets above 55mph for very little benefit.
Solid context that I hadn’t considered. Thanks.
You're talking about the "95 percentile" rule, right?