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The University of Aalborg Study on Daytime Flashing Lights forBicycles.



 
 
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  #1  
Old March 19th 17, 07:53 PM posted to rec.bicycles.tech
SMS
external usenet poster
 
Posts: 9,477
Default The University of Aalborg Study on Daytime Flashing Lights forBicycles.

I know how some people dislike any statements that are based on actual
facts, but the data are pretty clear.

See: https://books.google.com.au/books?id=LvthAgAAQBAJ&pg=PA168

It was interesting that in the Odense study, conducted by Reelight,
Odense Cycle City and the University of Aalborg, accident rates went
down by 32% with the use of daytime lights, but a cyclist's "sense of
security" went up by 85%!

Did they ride more dangerously because of the huge increase in their
"sense of security" and still experience a 32% decline?! Another study
showed that safety equipment increases an individual's dangerous
behavior, so if we could find a way to encourage the use of proven
safety equipment without increasing risky behavior, we'd be able to
change that 32% to a much higher number.

While a 32% decline in accident rates is significant, the 85% increase
in the "sense of security" could lead to more cycling, which will
further reduce the percentage of accidents.

The purpose of this whole study was to convince the government to make
flashing lights legal, since in some backward European countries
flashing lights are not legal. While this change in the law could
increase sales of Reelight, it also benefits every other light
manufacturer that produces flashing lights, and the other manufacturer's
produce much brighter daytime lights.

Hopefully the results of this study will lead to dynamo light
manufacturers adding a flash mode to lights that they export to
countries where flashing lights are legal. It just needs to be one
zero-ohm resistor that is installed or removed on the PCB. These lights
almost certainly already have a micro-controller that can be programmed
to do flash mode.

The bottom line is that we can all agree that daytime flashing lights on
bicycles are a very good idea and that greatly increase safety and that
their use should be encouraged. Frank now owns one of Barry Beam's
Oculus lights, so he can now experience the increased safety and
increased sense of security of a daytime flashing light as well as
increased visibility at night.

Now I have to go cash my check from Reelight.
  #2  
Old March 19th 17, 10:02 PM posted to rec.bicycles.tech
Jeff Liebermann
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Posts: 4,018
Default The University of Aalborg Study on Daytime Flashing Lights for Bicycles.

On Sun, 19 Mar 2017 11:53:38 -0700, sms
wrote:

I know how some people dislike any statements that are based on actual
facts, but the data are pretty clear.

See: https://books.google.com.au/books?id=LvthAgAAQBAJ&pg=PA168

It was interesting that in the Odense study, conducted by Reelight,
Odense Cycle City and the University of Aalborg, accident rates went
down by 32% with the use of daytime lights, but a cyclist's "sense of
security" went up by 85%!


According to the above URL, it "reduced the number of crashed by more
than 30%". Presumably, accidents without an associated crash were not
counted. Also, the study was conducted in 2005 in Denmark, a country
there cycling is far more common than in the US. The accidents were
self-reported which usually means that if someone is guilty of doing
something stupid on their bicycle, they are unlikely to report the
incident. It's also possible that the situation may have changed in
the last 12 years such as newer models by Reelight.

I also don't like terms like "30% reduction". In order to make sense
of that, the actual accident rates need to be disclosed. For example,
out of population of 2000 participants, a reduction from 3 accidents
to 2 accidents is a 33% reduction, as is a reduction from 300
accidents to 200 accidents. The former is bad joke while the latter
is probably statistically significant. Which is it?

The only link I can find to the original study is listed on the
Wikipedia Bicycle Lighting page as footnote 8. However the links to
both the original Danish and English translation are broken. Also, I
would have expected to see a copy of the study on the Reelight web
pile, but couldn't find anything. Duz anyone have a copy or a
functional link?

Oddly, the Reelight FAQ doesn't quite agree with the study:
https://www.reelight.com/en/faq/
"The number of accidents is not higher when it is dark.
However, the risk of being involved in a road accident is
greater at night than during daylight hours. This is why
bicycle lights are so important."

Note that they have a backup function, that continues to flash when
the bicycle is stopped:
"The backup function needs to charge the first time it is in use.
You need to ride the bike for 5-10 minutes for it to charge
fully and so that it will flash for a few minutes after you stop."

Do it thyself flashing tail light:
https://dr2chase.wordpress.com/2013/12/23/lights-for-a-beater-bike/

We've also been here befo
https://groups.google.com/forum/#!topic/rec.bicycles.tech/X0rymhXTgGo

Now I have to go cash my check from Reelight.


Such things are usually done by "loaning" you test samples of the
products, and then "forgetting" to recover them. In theory, you're
expected to declare the value of such samples as income for tax
purposes. Payments of cash or checks are rare unless you are hired as
a consultant.

--
Jeff Liebermann
150 Felker St #D
http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
  #3  
Old March 19th 17, 10:54 PM posted to rec.bicycles.tech
AMuzi
external usenet poster
 
Posts: 13,447
Default The University of Aalborg Study on Daytime Flashing Lights forBicycles.

On 3/19/2017 4:02 PM, Jeff Liebermann wrote:
On Sun, 19 Mar 2017 11:53:38 -0700, sms
wrote:

I know how some people dislike any statements that are based on actual
facts, but the data are pretty clear.

See: https://books.google.com.au/books?id=LvthAgAAQBAJ&pg=PA168

It was interesting that in the Odense study, conducted by Reelight,
Odense Cycle City and the University of Aalborg, accident rates went
down by 32% with the use of daytime lights, but a cyclist's "sense of
security" went up by 85%!


According to the above URL, it "reduced the number of crashed by more
than 30%". Presumably, accidents without an associated crash were not
counted. Also, the study was conducted in 2005 in Denmark, a country
there cycling is far more common than in the US. The accidents were
self-reported which usually means that if someone is guilty of doing
something stupid on their bicycle, they are unlikely to report the
incident. It's also possible that the situation may have changed in
the last 12 years such as newer models by Reelight.

I also don't like terms like "30% reduction". In order to make sense
of that, the actual accident rates need to be disclosed. For example,
out of population of 2000 participants, a reduction from 3 accidents
to 2 accidents is a 33% reduction, as is a reduction from 300
accidents to 200 accidents. The former is bad joke while the latter
is probably statistically significant. Which is it?

The only link I can find to the original study is listed on the
Wikipedia Bicycle Lighting page as footnote 8. However the links to
both the original Danish and English translation are broken. Also, I
would have expected to see a copy of the study on the Reelight web
pile, but couldn't find anything. Duz anyone have a copy or a
functional link?

Oddly, the Reelight FAQ doesn't quite agree with the study:
https://www.reelight.com/en/faq/
"The number of accidents is not higher when it is dark.
However, the risk of being involved in a road accident is
greater at night than during daylight hours. This is why
bicycle lights are so important."

Note that they have a backup function, that continues to flash when
the bicycle is stopped:
"The backup function needs to charge the first time it is in use.
You need to ride the bike for 5-10 minutes for it to charge
fully and so that it will flash for a few minutes after you stop."

Do it thyself flashing tail light:
https://dr2chase.wordpress.com/2013/12/23/lights-for-a-beater-bike/

We've also been here befo
https://groups.google.com/forum/#!topic/rec.bicycles.tech/X0rymhXTgGo

Now I have to go cash my check from Reelight.


Such things are usually done by "loaning" you test samples of the
products, and then "forgetting" to recover them. In theory, you're
expected to declare the value of such samples as income for tax
purposes. Payments of cash or checks are rare unless you are hired as
a consultant.


I read 'lights for beater'. Twice. Then did a page search
for coil, magnet, dynamo and battery. Found nothing. What
powers the lights?

Bonus question- What does the mirror do?

--
Andrew Muzi
www.yellowjersey.org/
Open every day since 1 April, 1971


  #4  
Old March 20th 17, 01:47 AM posted to rec.bicycles.tech
Jeff Liebermann
external usenet poster
 
Posts: 4,018
Default The University of Aalborg Study on Daytime Flashing Lights for Bicycles.

On Sun, 19 Mar 2017 16:54:07 -0500, AMuzi wrote:

On 3/19/2017 4:02 PM, Jeff Liebermann wrote:
Do it thyself flashing tail light:
https://dr2chase.wordpress.com/2013/12/23/lights-for-a-beater-bike/


I read 'lights for beater'. Twice. Then did a page search
for coil, magnet, dynamo and battery. Found nothing. What
powers the lights?


The top photo of the bicycle shows a hub dynamo on the front wheel.
Directly under the photo is:
"Note that there’s no off switch and no way to disconnect
anything but the hub without wire clippers or a soldering iron."
So, I guess it's powered by the hub. Since there's no on/off switch,
it's also a daytime tail light.

Bonus question- What does the mirror do?


Go to:
https://www.flickr.com/photos/dr2chase/11425296075
and drag the mouse around the photo. The captions for the mirror say
"Acrylic mirror to keep light down towards the road" and "Aluminum
angle - mirror glued to top, lights glued to front, holes drilled for
zip-tie attachment to basket".

The rectangular stick jammed between the mirror and basket is labeled"
Vertical aiming adjustment".

The cylindrical contraption is labeled "Greinacher-ish rectifier and
voltage doubler in corked tube". Schematic? Nope.

Other labels around the tangle of Romex electrical wire are "white
wire to hub AC power", "white wire to taillight", and "Connection of
rectifier to headlights, headlights to taillights, and taillights to
rectifier".

It's now kinda, maybe, sorta, almost, somewhat clear. If you want a
hub powered tail light to light up the road, that is how it can be
done.

His flickr page also has his helmet mounted headlight and tail light
combination:
https://www.flickr.com/photos/dr2chase/with/11425296075/
Soon, everyone will be wearing an optical test bench glued to their
helmet.

Please remind me not to reference a do-it-thyself web page without
first carefully reading it.



--
Jeff Liebermann
150 Felker St #D
http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
  #5  
Old March 20th 17, 06:33 PM posted to rec.bicycles.tech
Frank Krygowski[_4_]
external usenet poster
 
Posts: 10,538
Default The University of Aalborg Study on Daytime Flashing Lights forBicycles.

On 3/19/2017 8:47 PM, Jeff Liebermann wrote:

Soon, everyone will be wearing an optical test bench glued to their
helmet.


Of course! Anything less would not be safe enough!


--
- Frank Krygowski
  #6  
Old March 19th 17, 11:22 PM posted to rec.bicycles.tech
SMS
external usenet poster
 
Posts: 9,477
Default The University of Aalborg Study on Daytime Flashing Lights forBicycles.

On 3/19/2017 2:02 PM, Jeff Liebermann wrote:

The only link I can find to the original study is listed on the
Wikipedia Bicycle Lighting page as footnote 8. However the links to
both the original Danish and English translation are broken. Also, I
would have expected to see a copy of the study on the Reelight web
pile, but couldn't find anything. Duz anyone have a copy or a
functional link?


It's not free.
http://www.sciencedirect.com/science/article/pii/S0001457512002606.

I'll check on Tuesday if our library or Public Works department has
access to this journal.

  #7  
Old March 19th 17, 11:24 PM posted to rec.bicycles.tech
SMS
external usenet poster
 
Posts: 9,477
Default The University of Aalborg Study on Daytime Flashing Lights forBicycles.

On 3/19/2017 2:02 PM, Jeff Liebermann wrote:

Now I have to go cash my check from Reelight.


Such things are usually done by "loaning" you test samples of the
products, and then "forgetting" to recover them. In theory, you're
expected to declare the value of such samples as income for tax
purposes. Payments of cash or checks are rare unless you are hired as
a consultant.


Yes, but a couple of people in this group insist that the only reason I
favor good lights is because I am getting paid by light companies. The
fact that it isn't true doesn't matter to them. They will come up with
any excuse they can think of to try to ignore the data.

  #8  
Old March 20th 17, 01:51 AM posted to rec.bicycles.tech
Frank Krygowski[_4_]
external usenet poster
 
Posts: 10,538
Default The University of Aalborg Study on Daytime Flashing Lights forBicycles.

On 3/19/2017 6:24 PM, sms wrote:
On 3/19/2017 2:02 PM, Jeff Liebermann wrote:

Now I have to go cash my check from Reelight.


Such things are usually done by "loaning" you test samples of the
products, and then "forgetting" to recover them. In theory, you're
expected to declare the value of such samples as income for tax
purposes. Payments of cash or checks are rare unless you are hired as
a consultant.


Yes, but a couple of people in this group insist that the only reason I
favor good lights is because I am getting paid by light companies.


The remarks (generally about commission) arose because several of your
websites which touted dozens of products, and had at the bottom
statements something like "if you're going to buy one of these, please
start from this website so I get my commission."

And some of your web pages included a sort of brief resume in which you
bragged about doing "guerilla marketing" in bicycle forums.

Those statements seem to have been taken down now. But when they were
first discovered, there were links and quotes posted here.


--
- Frank Krygowski
  #9  
Old March 20th 17, 02:59 PM posted to rec.bicycles.tech
JBeattie
external usenet poster
 
Posts: 5,870
Default The University of Aalborg Study on Daytime Flashing Lights for Bicycles.

On Sunday, March 19, 2017 at 5:51:25 PM UTC-7, Frank Krygowski wrote:
On 3/19/2017 6:24 PM, sms wrote:
On 3/19/2017 2:02 PM, Jeff Liebermann wrote:

Now I have to go cash my check from Reelight.

Such things are usually done by "loaning" you test samples of the
products, and then "forgetting" to recover them. In theory, you're
expected to declare the value of such samples as income for tax
purposes. Payments of cash or checks are rare unless you are hired as
a consultant.


Yes, but a couple of people in this group insist that the only reason I
favor good lights is because I am getting paid by light companies.


The remarks (generally about commission) arose because several of your
websites which touted dozens of products, and had at the bottom
statements something like "if you're going to buy one of these, please
start from this website so I get my commission."

And some of your web pages included a sort of brief resume in which you
bragged about doing "guerilla marketing" in bicycle forums.

Those statements seem to have been taken down now. But when they were
first discovered, there were links and quotes posted here.


Check this out: https://academic.oup.com/eurpub/arti...enting-bicycle

Don't ride in Auckland, even with a blinky.

-- Jay Beattie.
  #10  
Old March 20th 17, 04:54 PM posted to rec.bicycles.tech
Jeff Liebermann
external usenet poster
 
Posts: 4,018
Default The University of Aalborg Study on Daytime Flashing Lights for Bicycles.

On Mon, 20 Mar 2017 06:59:40 -0700 (PDT), jbeattie
wrote:

Check this out: https://academic.oup.com/eurpub/arti...enting-bicycle
Don't ride in Auckland, even with a blinky.
-- Jay Beattie.


187 accidents among 162 participants in 6.4 years? The carnage in the
streets must be awful. I would expect all cyclists to be exterminated
within their expected lifetimes. If I ride for 64 years of my life, I
would expect to get hit about 10 times.

Maybe bicycle fashion is the problem?
https://www.google.com/search?q=dazzle+camouflage+bicycle+jacket&tbm=isch


--
Jeff Liebermann
150 Felker St #D
http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
 




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