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> it’s true that drivers are more aggressive towards helmet wearers Citation, please? > can't think of an accident where a helmet would help when I'm on the c

by op00to 4y ago

> it’s true that drivers are more aggressive towards helmet wearers Citation, please? > can't think of an accident where a helmet would help when I'm on the cargo bike. Right hook.

tboughen 4y ago
“cyclists were given 8.5cm (3.3 inches) more clearance by cars if they were not wearing helmets.” https://helmets.org/walkerstudy.htm https://helmets.org/walkerstudy.htm
- threeseed 4y ago
  You know that the article you posted was about refuting this claim: "After re-analysis of Walker's data, helmet wearing is not associated with close motor vehicle passing"
  - i_am_jl 4y ago
    Confirmation bias machine strikes again.
  - KennyBlanken 4y ago
    As discussed above: the "re-analysis" took an analog measurement, filtered it into a binary "close" or "not close" at an arbitrary distance threshold, and then patted themselves on the back when the found there was no difference.
ndsipa_pomu 4y ago
There's this Ian Walker study: https://www.sciencedirect.com/science/article/abs/pii/S0001457506001540 https://www.sciencedirect.com/science/article/abs/pii/S00014... It's a small sample size, so take with a pinch of salt.
- threeseed 4y ago
  Refutation of the Walker study which "assesses the extent to which the sample size in the original analysis may have contributed to spurious results". https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3783373/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3783373/
  - ndsipa_pomu 4y ago
    Response to the refutation: https://researchportal.bath.ac.uk/en/publications/bicycle-helmet-wearing-is-associated-with-closer-overtaking-by-dr https://researchportal.bath.ac.uk/en/publications/bicycle-he... Olivier and Walter re-analysed the same data in 2013 and claimed helmet wearing was not associated with close vehicle passing. Here we show how Olivier and Walter’s analysis addressed a subtly, but importantly, different question than Walker’s. Their conclusion was based on omitting information about variability in driver behaviour and instead dividing overtakes into two binary categories of ‘close’ and ‘not close’; we demonstrate that they did not justify or address the implications of this choice, did not have sufficient statistical power for their approach, and moreover show that slightly adjusting their definition of ‘close’ would reverse their conclusions. We then present a new analysis of the original dataset, measuring directly the extent to which drivers changed their behaviour in response to helmet wearing. This analysis confirms that drivers did, overall, get closer when the rider wore a helmet.
    - deleted 4y ago
      [deleted]
- alan99999 4y ago
  What Ian Walker's study failed to do was measure the amount of traffic, let alone the oncoming traffic. As he did different parts of his data collection on different days and on different roads, this key measure which often affects how far a car is able to move out going past a cyclist is a very obvious parameter to take into account. Ian's data set has times of passes in it so it might be possible to crate a proxy for traffic density but I haven't attempted this. I think it's more valid to conclude this study has no credence than to draw any conclusion from it.
u801e 4y ago
You can largely avoid right hooks by riding in the primary position/take the general purpose lane by default rather than riding towards the edge or in the bike lane.

by op00to 4y ago

> it’s true that drivers are more aggressive towards helmet wearers Citation, please? > can't think of an accident where a helmet would help when I'm on the cargo bike. Right hook.

tboughen 4y ago

“cyclists were given 8.5cm (3.3 inches) more clearance by cars if they were not wearing helmets.” https://helmets.org/walkerstudy.htm https://helmets.org/walkerstudy.htm

threeseed 4y ago
You know that the article you posted was about refuting this claim: "After re-analysis of Walker's data, helmet wearing is not associated with close motor vehicle passing"
- i_am_jl 4y ago
  Confirmation bias machine strikes again.
- KennyBlanken 4y ago
  As discussed above: the "re-analysis" took an analog measurement, filtered it into a binary "close" or "not close" at an arbitrary distance threshold, and then patted themselves on the back when the found there was no difference.

ndsipa_pomu 4y ago

There's this Ian Walker study: https://www.sciencedirect.com/science/article/abs/pii/S0001457506001540 https://www.sciencedirect.com/science/article/abs/pii/S00014... It's a small sample size, so take with a pinch of salt.

threeseed 4y ago
Refutation of the Walker study which "assesses the extent to which the sample size in the original analysis may have contributed to spurious results". https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3783373/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3783373/
- ndsipa_pomu 4y ago
  Response to the refutation: https://researchportal.bath.ac.uk/en/publications/bicycle-helmet-wearing-is-associated-with-closer-overtaking-by-dr https://researchportal.bath.ac.uk/en/publications/bicycle-he... Olivier and Walter re-analysed the same data in 2013 and claimed helmet wearing was not associated with close vehicle passing. Here we show how Olivier and Walter’s analysis addressed a subtly, but importantly, different question than Walker’s. Their conclusion was based on omitting information about variability in driver behaviour and instead dividing overtakes into two binary categories of ‘close’ and ‘not close’; we demonstrate that they did not justify or address the implications of this choice, did not have sufficient statistical power for their approach, and moreover show that slightly adjusting their definition of ‘close’ would reverse their conclusions. We then present a new analysis of the original dataset, measuring directly the extent to which drivers changed their behaviour in response to helmet wearing. This analysis confirms that drivers did, overall, get closer when the rider wore a helmet.
  - deleted 4y ago
    [deleted]
alan99999 4y ago
What Ian Walker's study failed to do was measure the amount of traffic, let alone the oncoming traffic. As he did different parts of his data collection on different days and on different roads, this key measure which often affects how far a car is able to move out going past a cyclist is a very obvious parameter to take into account. Ian's data set has times of passes in it so it might be possible to crate a proxy for traffic density but I haven't attempted this. I think it's more valid to conclude this study has no credence than to draw any conclusion from it.

u801e 4y ago

You can largely avoid right hooks by riding in the primary position/take the general purpose lane by default rather than riding towards the edge or in the bike lane.