Speed - "In the last 5m of braking you wipe off half your speed."
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Thread: Speed - "In the last 5m of braking you wipe off half your speed."

  1. #1
    User, Registered Array Daemon's Avatar
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    Speed - "In the last 5m of braking you wipe off half your speed."

    There’s been some recent discussion in another (tragic) thread about speed and accidents. So I thought it apropos to share a video I saw at an advanced riding course last year which illustrates what a huge difference even a few km/h in speed makes in the outcome in an emergency braking situation. Probably a repost but the message is worth repeating.


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    Registered User Array StevieMac's Avatar
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    I really like that video.
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    StevieMac- Any and all advice provided by me is of the "Use it at your own risk" variety. Common sense and your own good judgement must always prevail.

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    backslider Array K-rod's Avatar
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    best road-going advice ever posted on this forum (imo) - thank you.

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    Moderator Array CHIA's Avatar
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    Quote Originally Posted by StevieMac View Post
    I really like that video.
    I remember a very similar one at the Roadcraft Course last year, has always stuck with me, EVERYONE needs to understand this, EVERYONE needs to watch this.
    Quote Originally Posted by G Hats View Post
    A sore ass is better than a shredded back!
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    Moderator Array CHIA's Avatar
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    I'm going to make this a sticky, it's the best 1min most of us could invest.
    Quote Originally Posted by G Hats View Post
    A sore ass is better than a shredded back!
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    User, Registered Array Daemon's Avatar
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    Quote Originally Posted by StevieMac View Post
    I really like that video.
    Yes, indeed. All of the credit goes to StevieMac and crew at the Roadcraft Course.

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    +1 Array schmii's Avatar
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    I remember starting to ride and the beginning of every season (now). It's impressive how a little practice or professional training safely decreases braking distance especially when dealing with poor conditions. My first emergency stop involved immediately locking the rear and wasting so much precious stopping distance.

    Physics govern the distance 100% braking efficiency covers of course. Great video.
    Look not for happiness around the corner. Happiness is the corner. IBA#42642

  10. #8
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    Quote Originally Posted by schmii View Post
    I remember starting to ride and the beginning of every season (now). It's impressive how a little practice or professional training safely decreases braking distance especially when dealing with poor conditions. My first emergency stop involved immediately locking the rear and wasting so much precious stopping distance.

    Physics govern the distance 100% braking efficiency covers of course. Great video.
    And none of us, and I mean NONE of us get even CLOSE to 100% braking efficiency, right Schmii? The average for riders is more like 55% efficiency.

    At 55%, it takes a LOT further to stop.

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    Registered User Array pherthyl's Avatar
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    In the last 5m of braking you wipe off half your speed
    That doesn't make sense. Perhaps in this exact situation, but obviously that's not a general truth.
    My bikes: A random assortment of junk I found in a barn and fixed up.

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    Quote Originally Posted by pherthyl View Post
    That doesn't make sense. Perhaps in this exact situation, but obviously that's not a general truth.
    Of course you are right. In THIS scenario, you wipe off half your speed in the last 5 metres of braking.

    The general idea is though, is that MOST of your decelerating comes in the last short distance of the stop. So if it takes you 5 meters (or more) longer to complete the stop, you are still travelling at a large fraction of your original speed on impact.

    Ouch.

  13. #11
    Insert User Title Here. Array TripleTime's Avatar
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    Ya, but with bikes you also have all the other factors to look at. Like no airbags for a start.

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    Registered User Array pika's Avatar
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    never knew this.

    thanks.

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    From N00bie to Wannabe Array FASTn50's Avatar
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    If you don't pay attention to the message; you will probably scrub off half your speed in the last 5 cm!
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  16. #14
    Registered User Array pherthyl's Avatar
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    Quote Originally Posted by FASTn50 View Post
    If you don't pay attention to the message; you will probably scrub off half your speed in the last 5 cm!
    Well said.
    My bikes: A random assortment of junk I found in a barn and fixed up.

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    Better than LEGO. Array almost_barbie's Avatar
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    Yup, I remember the discussion in my BCSC course as well.
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