Braking distance for bicycles with all relevant data explained

Just out of interest I found probably the same info. that the Collision
investigators use to calculate braking distances for bicycles. The
distance from perception to stop at 30kph (just under 20mph) is 37m on a
level road. Metric and imperial versionss are both shown.

http://www.muggaccinos.com/Liability...opFormulae.htm

On Sun, 21 Feb 2016 13:48:07 +0000, MrCheerful
wrote:

Just out of interest I found probably the same info. that the Collision
investigators use to calculate braking distances for bicycles. The
distance from perception to stop at 30kph (just under 20mph) is 37m on a
level road. Metric and imperial versionss are both shown.

http://www.muggaccinos.com/Liability...opFormulae.htm

Interesting - there isn't much published research on the subject.
Hophead fixie peddlars always claim they can stop instantly (perhaps
in their heads they are) but it is interesting to see that for most
push bikes they can't even come close to the outdated 12m overall
stopping distance (6m braking distance) for a car at 20MPH.

On Sunday, February 21, 2016 at 1:48:12 PM UTC, MrCheerful wrote:
Just out of interest I found probably the same info. that the Collision
investigators use to calculate braking distances for bicycles. The
distance from perception to stop at 30kph (just under 20mph) is 37m on a
level road. Metric and imperial versionss are both shown.

http://www.muggaccinos.com/Liability...opFormulae.htm

Using these figures please explain how I did not collide with this taxi.
https://www.youtube.com/watch?v=sbq-6dP7ORo

Even the Pedal cycle construction and use regulation acknowledge that different types of bicycle have different stopping distances, as do the relevant British Standards.

On Sunday, 21 February 2016 19:08:20 UTC, Paul George wrote:

Using these figures please explain how I did not collide with this taxi.
https://www.youtube.com/watch?v=sbq-6dP7ORo

Easy.
QUOTE:
"Stopping distance in highway code is 23m at 30mph this can be reduced with; wider/ bigger tyres to increase traction + bigger brakes to increase braking power i.e a VW Golf GTI will stop faster than a stock Golf of the same weight with smaller wheels and brakes.

Stopping distance for a bike at 30mph according to http://www.exploratorium..edu/cycling/brakes2.html is 10.4m.

If the figures above are correct, the bike has enough braking power to brake in half the distance of a 'standard' car."

Simple physics.

On Sun, 21 Feb 2016 11:14:23 -0800 (PST), Alycidon
wrote:

If the figures above are correct, the bike has enough braking power to brake in half the distance of a 'standard' car."


It would have been useful if the author of that article had included
their calculations.

On Sunday, February 21, 2016 at 7:06:35 PM UTC, Peter Parry wrote:

Interesting - there isn't much published research on the subject.

Perhaps because there are too many variables involved.

Hophead fixie peddlars always claim they can stop instantly (perhaps
in their heads they are)

It must be so stressful to be a hater.

but it is interesting to see that for most
push bikes they can't even come close to the outdated 12m overall
stopping distance (6m braking distance) for a car at 20MPH.

But they can.

On Sunday, 21 February 2016 21:20:20 UTC, Paul George wrote:
On Sunday, February 21, 2016 at 7:06:35 PM UTC, Peter Parry wrote:

Interesting - there isn't much published research on the subject.

Perhaps because there are too many variables involved.

Hophead fixie peddlars always claim they can stop instantly (perhaps
in their heads they are)

It must be so stressful to be a hater.

but it is interesting to see that for most
push bikes they can't even come close to the outdated 12m overall
stopping distance (6m braking distance) for a car at 20MPH.

But they can.

Indeed - I could stop from 20mph inside the length of an ASL.
Drivers always seem to overshoot THEIR stop line though.

http://bit.ly/1QuFoNe

What is wrong with their brakes?

On 21/02/2016 21:31, Alycidon wrote:
On Sunday, 21 February 2016 21:20:20 UTC, Paul George wrote:
On Sunday, February 21, 2016 at 7:06:35 PM UTC, Peter Parry wrote:

Interesting - there isn't much published research on the subject.

Perhaps because there are too many variables involved.

Hophead fixie peddlars always claim they can stop instantly (perhaps
in their heads they are)

It must be so stressful to be a hater.

but it is interesting to see that for most
push bikes they can't even come close to the outdated 12m overall
stopping distance (6m braking distance) for a car at 20MPH.

But they can.

Indeed - I could stop from 20mph inside the length of an ASL.
Drivers always seem to overshoot THEIR stop line though.

http://bit.ly/1QuFoNe

What is wrong with their brakes?


Thinking distance at 20mph is longer than an ASL, so unless you have
some new form of time dilation physics, you cannot.

On 21/02/2016 21:20, Paul George wrote:
On Sunday, February 21, 2016 at 7:06:35 PM UTC, Peter Parry wrote:

Interesting - there isn't much published research on the subject.

Perhaps because there are too many variables involved.

Hophead fixie peddlars always claim they can stop instantly (perhaps
in their heads they are)

It must be so stressful to be a hater.

but it is interesting to see that for most
push bikes they can't even come close to the outdated 12m overall
stopping distance (6m braking distance) for a car at 20MPH.

But they can.



Then why can't they stop at traffic lights? or pedestrian crossings, Or
before riding into the side of a bus? back of a car, pedestrian, other
cyclist, toddler, lamp post , dog etc. etc.

On Sunday, February 21, 2016 at 10:02:59 PM UTC, MrCheerful wrote:


Then why can't they stop at traffic lights? or pedestrian crossings, Or
before riding into the side of a bus? back of a car, pedestrian, other
cyclist, toddler, lamp post , dog etc. etc.

Apparently because it takes 37 metres to stop a pedal cycle from 20mph.
If the light changes when the cyclist is 36.99999999999999 metres away it is not the cyclist's fault.
According to you.