revtothelimit - motorbike forum

Scootabout wrote: Thu Sep 08, 2022 10:23 pm What about this for visibility, from the V85TT? Actually a serious question, as I now have one.

https://images.app.goo.gl/gyYC9nE1SfvVmt8d9

Visibility is how easily something can be seen if you know it's there and view is not obstructed. eg, look at the 'eagle' DRL on that Guzzi

Conspicuity is how well something attracts attention. There are three types: search, attention, cognitive. Then there's 'insight'.

Good explanation here:
https://www.semanticscholar.org/paper/P ... 57ef5c9b3e

At 30mph you're at risk about 3 - 4 seconds from a junction, so C. 50 metres. How big (width) and bright is the DRL at that distance?

[Roughly 14 metres per second at 30mph]

Horse wrote: Thu Sep 08, 2022 11:23 pm Didn't say there was.

But that is what people expect from the triangle.

Horse wrote: Fri Sep 09, 2022 7:06 am
At 30mph you're at risk about 3 - 4 seconds from a junction, so C. 50 metres. How big (width) and bright is the DRL at that distance?

[Roughly 14 metres per second at 30mph]

And since you can stop in ten metres from 30 mph (if prepped to do so), how close do you have to be to come within 'visual range'?

The Spin Doctor wrote: Fri Sep 09, 2022 2:36 pm

Horse wrote: Fri Sep 09, 2022 7:06 am
At 30mph you're at risk about 3 - 4 seconds from a junction, so C. 50 metres. How big (width) and bright is the DRL at that distance?

[Roughly 14 metres per second at 30mph]

And since you can stop in ten metres from 30 mph (if prepped to do so), how close do you have to be to come within 'visual range'?

Whose, theirs or yours?

The Spin Doctor wrote: Fri Sep 09, 2022 2:36 pm

Horse wrote: Fri Sep 09, 2022 7:06 am
At 30mph you're at risk about 3 - 4 seconds from a junction, so C. 50 metres. How big (width) and bright is the DRL at that distance?

[Roughly 14 metres per second at 30mph]

And since you can stop in ten metres from 30 mph (if prepped to do so), how close do you have to be to come within 'visual range'?

Good question, didn't see that coming

1. You might be able to stop? That outcome might depend on many factors.
2. 'Prepped'. Presumably you mean a rider who is thinking about what might happen, has rolled the throttle closed, covered the brakes, is aware of the car and driver, etc etc, rather relying on conspicuity aids.
3. 'Visual range'? I can see many stars in the heavens on a clear night (those that're visible). But if we get into long-distance stuff, then we're also getting into see and forget. "Wassat, Hoss?"

Well, looking closer than 'stars', how far away might a driver see a bike? Potentially quite a way, albeit the driver might have trouble accurately judging its distance and speed (and so arrival time, aka - sadly - time to contact).

So the driver might see the bike, wait, mentally get bored - and forget the bike (possible working memory limitations).

Squirrel!

What? Oh, what was I saying. Never mind. Crunch. Sorry, mate, ...

That link's dead for me.

The Spin Doctor wrote: Thu Sep 08, 2022 4:05 pm All in www.scienceofbeingseen.org.uk

ChrisW wrote: Fri Sep 09, 2022 3:52 pm That link's dead for me.

The Spin Doctor wrote: Thu Sep 08, 2022 4:05 pm All in www.scienceofbeingseen.org.uk

Try
www.scienceofbeingseen.org

Hang on, does this help?

www . Scienceofbeingseen . org

Horse wrote: Fri Sep 09, 2022 3:59 pm Try
www.scienceofbeingseen.org

Hang on, does this help?

www . Scienceofbeingseen . org

Where's the slap head icon? I don't even know my own website!

The Spin Doctor wrote: Sat Sep 10, 2022 1:04 am

Horse wrote: Fri Sep 09, 2022 3:59 pm Try
www.scienceofbeingseen.org

Hang on, does this help?

www . Scienceofbeingseen . org

Where's the slap head icon? I don't even know my own website!

Not so much 'see and forget' as 'see see see see and forget'?

Hmmm 'anti matador effect' is what you need.

Bulls, along with all other cattle, are color-blind to red. Thus, the bull is likely irritated not by the muleta’s color, but by the cape’s movement as the matador whips it around. In support of this is the fact that a bull charges the matador’s other cape — the larger capote — with equal fury. Yet this cape is magenta on one side and gold or blue on the other.

Movement to attract attention - but to avoid harmful contact!

@The Spin Doctor Was anyone from Richa in the SOBS audience? You mightn't have seen them in a 'ghost' jacket.

The Spin Doctor wrote: Sat Sep 10, 2022 1:04 am A very recent development is a jacket that is entirely coated with retro-reflective material. Although above low-beam headlights, there is always some scattered light which makes reflective material ‘glow’ rather than shine. Being sleeved, these ‘ghost’ jackets create a human silhouette. I’d suggest they are far more conspicuous than ‘traffic vests’. Already adopted by cyclists and walkers, the first motorcyclists are starting to wear them.

I covered those in an Elevenses some months ago, if I remember right