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261
Amsterdam prepares to ‘ban the fatbikes’ amid rise in serious accidents [The Netherlands] (www.theguardian.com)
submitted 1 day ago* (last edited 1 day ago) by HowRu68@lemmy.world to c/europe@feddit.org
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The safety organisation VeiligheidNL estimates that 5,000 fatbike riders are treated in A&E [ i.e Accident & Emergency] departments each year, on the basis of a recent sample of hospitals. “And we also see that especially these young people aged from 12 to 15 have the most accidents,” said the spokesperson Tom de Beus.

Now Amsterdam’s head of transport, Melanie van der Horst, has said “unorthodox measures” are needed and has announced that she will ban these heavy electric bikes from city parks, starting in the Vondelpark. Like the city of Enschede, which is also drawing up a city centre ban, she is acting on a stream of requests “begging me to ban the fatbikes”.

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[–] HaraldvonBlauzahn@feddit.org 6 points 16 hours ago* (last edited 16 hours ago) (2 children)

In principle, this is correct. But the need for a helmet increases massively with speed.

Consider the end speed of free fall when falling a certain height - or the inverse, height in meters versus speed in kilometer per hour. It is:

10 km/h   ..... 0.39 meter
20 km/h   ..... 1.57 meter
30 km/h   ..... 3.54 meter
40 km/h   ..... 6.29 meter
50 km/h   ..... 9.83 meter

Would you jump from ten meters height into a concrete surface? Few people would, because it is almost certain that you die. But the frame pillar of a car is equally hard as such a surface.

Another data point: In the center of Copenhagen, not so many people use a helmet, but the speed is typically between 10 and 15 km/h - so many bikes there ! - and the number of serious accidents is very low. The contrary is the case for Germany.

And just to make a point: Using a helmet is always safer.

[–] CyberEgg@discuss.tchncs.de 6 points 16 hours ago (2 children)

So? Nobody is arguing about this but you. Again, my point is not about speeds or certain types of helmets. I just said you should wear a helmrt on bikes FFS!

[–] SaveTheTuaHawk@lemmy.ca -4 points 8 hours ago (1 children)

Every winter in Canada people die from slipping on ice. Walking in winter should require a helmet, but people would find that absurd.

[–] CyberEgg@discuss.tchncs.de 3 points 8 hours ago

Okay give me the numbers of fatal pedestrian slips versus fatal bicycle accidents that would not have been fatal if a helmet was worn. Give me data.

[–] cristian64@reddthat.com 2 points 14 hours ago

I think the point is that the convenience of being able to ride a bike without having a helmet at hand is something beneficial for the group. That it, there would be fewer cyclists if wearing a helmet was mandatory, and that would harm cyclists as a group.

By all means, if you consistently go over 20km/h on bike, wear a helmet, as at that speed it's starting to get dangerous.

[–] HaraldvonBlauzahn@feddit.org 3 points 16 hours ago

Here is the python code I used to compute the above table:

 >>> def fall_height_from_fall_speed_kms(v):
 ...   v_ms=v/3.6
 ...   a = 9.81 # m / s **2
 ...   t = v_ms / a
 ...   h = t ** 2 * a / 2
 ...   return h