Keeping to 20 mph

[Buckman]

After reading up on the ACC, it seems I have been using it anyway? However even when not using the ACC, the Yaris will still brake or twitch steering if the system thinks there is danger ahead. I was taught to drive at high speeds and to advanced driving standards and the one thing we were taught was never to brake on a bend however the Yaris does just this as it thinks the trees on the other side of the road are a danger. On a wet road the consequences could be terrifying!

Whoever decided to impose these onerous gadgets on car manufacturers is obviously not a driver. If one needs to rely on all these gadgets to get safely from A to B, maybe they should not be on the road?

 

[Dustydog]

No mine doesn’t have active sign recognition, but the satnav shows speed limit relayed to the message screen in front of me. What makes you think that ACC makes the driver switch off? I could say that being on CC is not as good because at the driver is needing to keep making adjustments either actually, or mentally due to variations in speed of nearby traffic. Is there any evidence to support your view?

My Sat nav shows the speed limits ,but in Scotland and Wales it still shows 30 rather than the 20 which seems to have been brought in over the last two years.

Of course there’s no evidence ! Just an opinion on whether technology should be a prime mover or just a driver aid. From what you and others have said it appears to be a radar system with a specific distance set presumably synched with speed.
There are some who don’t pay attention to the distant range of vision and become reliant on the ACC.
Just a point of view Clive

 

[otherclive]

After reading up on the ACC, it seems I have been using it anyway? However even when not using the ACC, the Yaris will still brake or twitch steering if the system thinks there is danger ahead. I was taught to drive at high speeds and to advanced driving standards and the one thing we were taught was never to brake on a bend however the Yaris does just this as it thinks the trees on the other side of the road are a danger. On a wet road the consequences could be terrifying!

Whoever decided to impose these onerous gadgets on car manufacturers is obviously not a driver. If one needs to rely on all these gadgets to get safely from A to B, maybe they should not be on the road?

I’m now on my third car with automatic emergency braking, current one RAV4 and Kia Rio, and although we explore all sorts of roads the only time I have ever felt it activate was a sightly too fast entry to our drive with garage door ahead. I tend to set the response at medium setting, but your Yaris is more modern than the cars I've had it on, and perhaps it’s sensors and processors respond more widely.

 

[otherclive]

My Sat nav shows the speed limits ,but in Scotland and Wales it still shows 30 rather than the 20 which seems to have been brought in over the last two years.

Of course there’s no evidence ! Just an opinion on whether technology should be a prime mover or just a driver aid. From what you and others have said it appears to be a radar system with a specific distance set presumably synched with speed.
There are some who don’t pay attention to the distant range of vision and become reliant on the ACC.
Just a point of view Clive

Methinks a satnav update could be on the Christmas list. But even they aren’t foolproof. Mine has picked up a new mandatory 40 mph on the A350 dualling project. It picked up the variable limits at the M5M4 Almondsbury gantries even as they changed. But despite two full software updates it still thinks it’s 40mph from M4 Jnct 17 southbound on the 70mph A350 dual carriageway until you pass the 50 mph limit just prior to traffic lights about 1.5 miles south of J17. Welsh 20 mph ones picked up too. It gets current updates OTA but gaps in the data base aren’t seemingly addressed. Should we trust such technology? Yes, with a degree of caution and scepticism.

 

[JTQ]

The only "gripe" I have with our Golf's ACC is it getting involved on the likes of motorway exits, where a following car accelerates up our inside, aiming to exit at a higher speed than our cruising speed. The Golf is provoked to slow down.
Not that I understand why those leaving motorways feel a need to accelerate away when coming off only then likely to have to brake shortly later.

 

[Dustydog]

I’m now on my third car with automatic emergency braking, current one RAV4 and Kia Rio, and although we explore all sorts of roads the only time I have ever felt it activate was a sightly too fast entry to our drive with garage door ahead. I tend to set the response at medium setting, but your Yaris is more modern than the cars I've had it on, and perhaps it’s sensors and processors respond more widely.

For a laugh 🙉 how do you think this system would respond if you drive under power at 30 mph towards a brick wall🤪Worth a punt maybe 😉

 

[otherclive]

For a laugh 🙉 how do you think this system would respond if you drive under power at 30 mph towards a brick wall🤪Worth a punt maybe 😉

if you look at the car’s NCAP report you can get chapter and verse on how it might cope. Though hope not to test it. On the first YouTube NCAP tests you can actually see videos of cars being tested for emergency autonomous braking, or pedestrian detection braking, etc. I can’t understand why anyone would doubt the potential of such systems providing supplementary backup capabilities

https://cdn.euroncap.com/media/55650/euroncap-2019-toyota-rav4-datasheet.pdf

View: https://www.youtube.com/watch?v=KW6rMl8DIgY



PS this next video shows a BYD sea lion tire puncture control system working with two simultaneous blow outs on one side. Takes me back to my Citroen BX16 estate, which could resist a tyre blowout using its hydraulic suspension.

View: https://www.youtube.com/watch?v=G1g00OwOj2I

 

[RogerL]

Questioning the effectiveness of emergency autonomous braking is like questioning the effectiveness of a RCD fitted to caravans - they're designed to trip fast enough to protect a person with poor cardiac health, but they're not actually tested like that.

 

[otherclive]

Questioning the effectiveness of emergency autonomous braking is like questioning the effectiveness of a RCD fitted to caravans - they're designed to trip fast enough to protect a person with poor cardiac health, but they're not actually tested like that.

I really don’t understand what you are saying. Is it that someone with poor cardiac health has slower responses than one with good cardiac health. What’s a RCD got to do with cardiac health, other than an electric shock isn’t going to do a heart any favours irrespective of whether it’s a healthy or unhealthy heart.

 

[RogerL]

I really don’t understand what you are saying. Is it that someone with poor cardiac health has slower responses than one with good cardiac health. What’s a RCD got to do with cardiac health, other than an electric shock isn’t going to do a heart any favours irrespective of whether it’s a healthy or unhealthy heart.

People with poor cardiac health are less likely to survive an electric shock - but an RCD should be fast enough to protect them.

When I fitted mains electrics to my first caravan, I paid an electrician to test it - he failed the RCD on speed - when he tested the replacement RCD, which passed, he made the claim that it had to operate fast enough to protect someone with poor cardiac health - I challenged him to a demonstration but he declined!

 

[Buckman]

Methinks a satnav update could be on the Christmas list. But even they aren’t foolproof. Mine has picked up a new mandatory 40 mph on the A350 dualling project. It picked up the variable limits at the M5M4 Almondsbury gantries even as they changed. But despite two full software updates it still thinks it’s 40mph from M4 Jnct 17 southbound on the 70mph A350 dual carriageway until you pass the 50 mph limit just prior to traffic lights about 1.5 miles south of J17. Welsh 20 mph ones picked up too. It gets current updates OTA but gaps in the data base aren’t seemingly addressed. Should we trust such technology? Yes, with a degree of caution and scepticism.

Why not download an app like TomTom to your phone, link the phone to the car and use the TT app for journeys or simply use it on the phone to compare the inbuilt Satnav. We have never had a car where the inbuilt Satnav is up to date. Cannot understand why a stand alone Satnav can update on its own, but the inbuilt Satnav can only be updated by the dealer and this may only happen once every 2 - 3 years!

 

[otherclive]

Why not download an app like TomTom to your phone, link the phone to the car and use the TT app for journeys or simply use it on the phone to compare the inbuilt Satnav. We have never had a car where the inbuilt Satnav is up to date. Cannot understand why a stand alone Satnav can update on its own, but the inbuilt Satnav can only be updated by the dealer and this may only happen once every 2 - 3 years!

My comment was to Dusty Dog not wrt my satnav, which is fine for navigation, weather and traffic alerts, fuel pricing/location, speed camera alerts and parking location/availability. Its weak point is that there are stretches of road where its database doesn’t correlate with the posted road sign speed limit. It doesn’t have road sign reading. So mine is a minor irritant but since it’s the first car I’ve had where it shows if I’m exceeding a speed limit I can live with the minor glitch. Apart from the Speedo of course. 😂

I’ve updated it twice now using downloads from the Toyota portal. Full updates covering UK and Europe. Just download to usb, insert into cars data port on dashboard and wait patiently for it to install. Toyota issue two updates per year, Spring and Autumn. I’ve got Spring 2025 installed. But there must be gaps in its database wrt speed limit accuracy going back some time. It does though do OTA update the active services I listed above, that’s how it knew that a local 40 mph limit had been introduced to cover 18 months of roadworks. So it’s not all gloom.

I could use AppleAirplay for Apple Maps or Google mapping via my phone on to the cars display screen, so no need for Tom Tom or others like Waze.