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From: Jeff Layman <Jeff@invalid.invalid>
Newsgroups: sci.electronics.design
Subject: Re: Speed limiters
Date: Sat, 6 Jul 2024 07:49:56 +0100
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On 06/07/2024 00:28, Don Y wrote:
> Article in /The Guardian/ suggests these are already (optionally)
> present in EU vehicles and soon to be *mandatory*?
> 
> But, it seems that these don't truly *limit* speed; rather, they
> signal when the speed limit has been *exceeded*.

In my old(ish) 2015 Honda Jazz (Fit in USA), it does both. A camera 
detects the speed limit and shows it on the dash display. I can then 
choose to set the "limiter" - better called "speed detector" to that 
speed (+/- a few mph if I wish). When the car gets to that speed an 
alarm sounds and the car will not accelerate beyond that speed on the 
level or going uphill. It will happily continue increasing its speed 
well beyond the limit if going downhill, with the alarm beeping away!

It does *not* apply the brake automatically when entering a lower speed 
limit area when the "limiter" is set. That could be dangerous to anyone 
following closely behind.

> And, can be disabled?

It's disabled by default when I start the car. It has to be turned on 
when I want it.

> Do vehicles "tattle" on drivers that exceed the limit?  Or, is it
> intended as a reminder (nag!) to help people drive more safely?

Well, supposedly the latter, but I wonder if it's stored in the cars 
memory somewhere and can be accessed when the car's serviced.

Note that on more modern cars it is often linked to the Satnav/GPS where 
speed limits are known by position rather than signage. Of course, if 
you don't keep your Satnav's database up-to-date that's another matter 
entirely. ;-)

-- 
Jeff