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. |
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 |
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 |
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. |
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. |
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 |
The University of Aalborg Study on Daytime Flashing Lights for Bicycles.
On Sunday, March 19, 2017 at 6:56:22 PM UTC, sms wrote:
Odense My ancestor, Odin, who was worshiped as a god by the Anglo-Saxons until the coming of Christianity, lived on Odense, an island off the coast of Jutland, where the city of Odense, named for him, now stands. Of course he wasn't a god to start with. He was a warrior and a poet, but then all chiefs were warriors and were expected to be poets as well; in addition he was widely recognized as a moral philosopher and he had lots of really violent descendants, including Horsa and Hengist, who founded the British nation. They were Jutes, like Odin, but the Jutes were a small tribe, so the mass of Anglo-Saxon johnny-come-latelies just claimed them, and Odin, for their own history. The Encyclopedia Britannica, at least in the famous 11th edition which I use, got it right, but who listens to the Britannica except the truly well-educated, whose relatives probably wrote the relevant articles. Andre Jute It helps your posterity to have lots of really violent descendants PS Don't ask: I don't know if Odin cycled before he became too dignified, being a god, to ride a bicycle like the other Jutes, now called Danes. |
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 |
The University of Aalborg Study on Daytime Flashing Lights for Bicycles.
On Sun, 19 Mar 2017 15:24:31 -0700, 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 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. If you arrange with Reelight to send your persecutors some free sample lights, they might be inclined to reconsider their position. The problem here is that if you are repeatedly accused of some dastardly crime against the cycling multitudes, such as accepting payola from a vendor, the mere repetition of the accusation will eventually cause it to become a truism. Anyone who searches the web for bicycle lighting recommendations will eventually blunder across those accusations. The casual reader is more likely to accept the accusations at face value than to continue reading the subsequent discussion material. You might consider writing a explanation, FAQ, or manifesto on the topic, which you can reference in future discussions on the topic. Please have them ship the bribe, errr... evaluation sample, to the address below. -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
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%! 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. I find your research somewhat less than complete. Or to put it another way, you carefully extracted certain figures from the study and ignored major portions. Quite contrary to what you imply the simple addition of fixed daytime lights was only part of a major program to improve safety in the city of Odense which also included: "Activities: Salt on the streets instead of gravel (which gives more punctures) Lanes for bikes where cars must give way Lanes for bicylists where they don't have to stop for red light but can continue Lending of bicycle trailers for kids Lending of powered bicycles Lending of tandem bikes The police exchanging fines for driving without light, to bicycle lights The Cyclist of the year award Exhibition for Better Bikes and possibility of having the bike checked (to get ready for the summer biking season) Campaign: We are biking to work distribution of badges to people participating in the campaign Providing drinking water and bicycle pumps several places in Odense Cycle barometers (speed and amount of cyclists passing each day)" And Amazingly, it worked. "According to the police the annual number of personal injuries amongst cyclists due to accidents involving more than one party fell by 19 per cent in the Municipality of Odense from the base years 1996-1997 to the period 1999-2002, when the Cycle City project was being implemented, and by 20 per cent up to the year 2002. Thus the project achieved its objective of reducing the number of cyclists killed or injured in accidents involving more than one party by 20 per cent by the end of 2002 as against the base years 1996- 1997. The trend of personal injuries amongst cyclists due to accidents involving more than one party followed the general trend. As there has been a significant increase in the volume of bicycle traffic in the Municipality of Odense in comparison to the trend in general, the risks of cycling in Odense have thus fallen more in Odense than other large Danish cities." The moral of this little story is that there is a danger in quoting sources. Some rotten, no good, SOB, might read them. -- Cheers, John B. |
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