Emergency braking - eh?

[coppice]

Seen this happen on a Fiat Abarth 595 at a hillclimb . Looked.most odd in that context

[Hammy98]

My Mini Cooper S does this, apparently the sensitivity can be adjusted through bimmercode.

I personally find mine a bit too sensitive, can make you look a right tit as the hazards don't always turn themselves off.

[Fastdruid]

Max_Torque said:

What triggers the system is not just the rate of deccel, but the speed at which you stop braking! If that is bellow about 20mph, the system triggers at a lower deccel threshold, because you have become a 'stationary Hazard' in the road. You can do a full threshold brake (1g) and as long as you stay about roughly 20mph the brake lights wont' come on (so the systems doesn't generally trigger on track etc)

I thought one of the triggers was the time taken to go from accelerator to brake. ie if it is planned you take a leisurely move from one to other (or going from fully off the throttle), if it's unplanned (emergency) then you're straight off the accelerator and then on the brakes...

I think mine is meant to only trigger hazards at motorway speeds (its a 2008 Mondeo so doesn't have all the low speed avoidance etc that more modern cars have).

I know I've triggered mine inadvertently in a "full bore, straight to hard brakes" move before.

[Pica-Pica]

Fastdruid said:

Max_Torque said:

What triggers the system is not just the rate of deccel, but the speed at which you stop braking! If that is bellow about 20mph, the system triggers at a lower deccel threshold, because you have become a 'stationary Hazard' in the road. You can do a full threshold brake (1g) and as long as you stay about roughly 20mph the brake lights wont' come on (so the systems doesn't generally trigger on track etc)

I thought one of the triggers was the time taken to go from accelerator to brake. ie if it is planned you take a leisurely move from one to other (or going from fully off the throttle), if it's unplanned (emergency) then you're straight off the accelerator and then on the brakes...

I think mine is meant to only trigger hazards at motorway speeds (its a 2008 Mondeo so doesn't have all the low speed avoidance etc that more modern cars have).

I know I've triggered mine inadvertently in a "full bore, straight to hard brakes" move before.

I assume that if you are on cruise control, and foot off acc pedal, the system will recognise that as being 'under power'

[Fastdruid]

Pica-Pica said:

Fastdruid said:

Max_Torque said:

What triggers the system is not just the rate of deccel, but the speed at which you stop braking! If that is bellow about 20mph, the system triggers at a lower deccel threshold, because you have become a 'stationary Hazard' in the road. You can do a full threshold brake (1g) and as long as you stay about roughly 20mph the brake lights wont' come on (so the systems doesn't generally trigger on track etc)

I thought one of the triggers was the time taken to go from accelerator to brake. ie if it is planned you take a leisurely move from one to other (or going from fully off the throttle), if it's unplanned (emergency) then you're straight off the accelerator and then on the brakes...

I think mine is meant to only trigger hazards at motorway speeds (its a 2008 Mondeo so doesn't have all the low speed avoidance etc that more modern cars have).

I know I've triggered mine inadvertently in a "full bore, straight to hard brakes" move before.

I assume that if you are on cruise control, and foot off acc pedal, the system will recognise that as being 'under power'

Unsure tbh, I'm not sure if they also look at how fast and hard the brake itself is applied rather than how quickly it's applied after the throttle and how quickly it is decelerating.

[Bumblebee7]

I don't have this on my car but think it's a great feature. Far too many people tailgating and not paying attention for my liking on the roads.

[Funky Squirrel]

Fastdruid said:

Unsure tbh, I'm not sure if they also look at how fast and hard the brake itself is applied rather than how quickly it's applied after the throttle and how quickly it is decelerating.

Correct, Aygo fleet car does this, apply full brake slowly no hazard lights. Apply light braking quickly lights come on. It is quite fun on country lanes.

[nickfrog]

CoolHands said:

It’s a state of mind, dear

Ah ok got it. Nothing to do with the State then.

[ecsrobin]

coppice said:

Seen this happen on a Fiat Abarth 595 at a hillclimb . Looked.most odd in that context

Yep most annoying. Basically fiat didn’t adjust the sensitivity from the normal car to a car fitted with Brembos.

Annoying on a trackday https://youtu.be/vc5Ma_BkC_o

[Monkeylegend]

Car manufacturers have been building in these latent safety systems for many years. For example every time a Lada crashes it turns the windscreen wipers on.

[Flibble]

Bumblebee7 said:

I don't have this on my car but think it's a great feature. Far too many people tailgating and not paying attention for my liking on the roads.

I prefer the BMW two stage brake lights, prevented me hitting a car I was following when they went from gentle braking to a full on stop.