> Chances are that the 38mph number came from the car itself, so there should be no "variance", leave alone 3mph over the limit.
My understanding, which may be incorrect, is that the 38mph number came from GPS recording, and that "cruise control" in Uber's self driving vehicles is not based on GPS speed, due to the impact poor/loss off GPS signal would impact it.
>Modern cruise controls are perfectly capable of maintaining set speed, even at a considerable downhill.
I'm not particularly handy with repairing cars, but I have a pretty decent understanding of how cruise control systems work due to nerding out on it when I bought a car with adaptive cruise control. Everything I have read on the design of cruise control says this simply isn't the case, because it isn't even a design goal. Much more important in the design is keeping close to it while maximizing fuel efficiency and driver comfort, and even in modern cruise control not all systems have access to the brakes, which would be required for keeping it at the set speed going considerably downhill. Anecdotally, all of the cars I have owned fit this and do not keep my vehicle at exactly the set speed, including the most recent one with ACC.
My understanding, which may be incorrect, is that the 38mph number came from GPS recording, and that "cruise control" in Uber's self driving vehicles is not based on GPS speed, due to the impact poor/loss off GPS signal would impact it.
>Modern cruise controls are perfectly capable of maintaining set speed, even at a considerable downhill.
I'm not particularly handy with repairing cars, but I have a pretty decent understanding of how cruise control systems work due to nerding out on it when I bought a car with adaptive cruise control. Everything I have read on the design of cruise control says this simply isn't the case, because it isn't even a design goal. Much more important in the design is keeping close to it while maximizing fuel efficiency and driver comfort, and even in modern cruise control not all systems have access to the brakes, which would be required for keeping it at the set speed going considerably downhill. Anecdotally, all of the cars I have owned fit this and do not keep my vehicle at exactly the set speed, including the most recent one with ACC.