Slow Teslas everywhere: 24 hours into ‘the FSD button’ • Hacker News Board

Re: Slow Teslas everywhere: 24 hours into ‘the FSD button’

#31

Post by spectrum1234 » Mon, Sep 27, 2021, 4:51 PM UTC

Traster wrote: post #29

I find this fascinating, because Tesla is meant to be able to completely autonomously drive a vehicle, so it knows how to drive safely, so what you would expect is just running the self-driving programme and getting it to judge how safe the real driver's actions are - ie, Tesla saw hazard X at time T, driver responded at time T+delta etc. That's what I would expect. Yet instead of this they've got something that coul…

This must be what they will be doing once they are farther along with the Dojo supercomputer. 100%

Re: Slow Teslas everywhere: 24 hours into ‘the FSD button’

#32

Post by ReidZB » Mon, Sep 27, 2021, 6:31 PM UTC

Traster wrote: post #28

ReidZB wrote: post #17

I don't get it. The article clearly outlines the factors accounted in the safety score, and vehicle speed is not one of them (at least not directly). Yet the author and apparently others are intentionally driving slowly to boost their score? That doesn't make sense. You can definitely "game" the score (to an extent) by making unnecessary trips, i.e. driving to give it more data, but driving abnormally slowly on those…

If I drive slowly the likelihood of spotting a forward collision early is higher and I have more time to react, and certainly the speed differential as I approach some stopped traffic is lower reducing my braking intensity. If I'm driving slower I can make the same radius turn with lower Gs improving that rating, and I'm also going to be much more likely to be following safely since at the lower speed I can be closer…

That's assuming you're varying only speed and not e.g. following distance. I try to leave at least 3 seconds' distance pretty much always (often more), so I have a pretty consistent amount of time to react regardless if I'm driving 30 mph or 55 mph.

Additionally, most of the metrics are cut-offs. It doesn't matter if you brake very gradually or if you brake very close to the area where it penalizes you. Based on my driving so far, the hard braking threshold is pretty forgiving. Yesterday, I let off the accelerator completely and went full-regen braking and it didn't care.

Anyway, I've driven 99 miles (highway/city mix) with the Safety Score thing turned on, and I'm still at score 100. I haven't slowed down at all.

Re: Slow Teslas everywhere: 24 hours into ‘the FSD button’

#33

Post by sidibe » Tue, Sep 28, 2021, 2:37 AM UTC

jdlshore wrote: post #23

notka wrote: post #3

My take-away is that Tesla is selecting for drivers with easy roads.

What is a “hard road” and how does it lead to higher rates of hard braking (-0.3g) and turning (lateral 0.4g) and <1s following distance at speeds over 50mph?

Hard roads and highways are ones where lots of cars need to change lanes in not much space. For example sections where entrances are quickly followed by exits always end up with more hard braking.