BC Sport Bikes Forum banner

1 - 20 of 39 Posts

·
User, Registered
Joined
·
142 Posts
Discussion Starter #1
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.

 

·
Registered
Joined
·
987 Posts
I really like that video. :)
 

·
+1
Joined
·
2,281 Posts
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.
 

·
Registered
Joined
·
92 Posts
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.
 

·
Registered
Joined
·
92 Posts
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.
 

·
From N00bie to Wannabe
Joined
·
4,839 Posts
If you don't pay attention to the message; you will probably scrub off half your speed in the last 5 cm! :eek
 

·
Beer League Racer/Asshole
Joined
·
5,206 Posts
wow. powerful.
 

·
Registered
Joined
·
7,695 Posts
Meh.....if you'd have been going 120km/h instead of 90km/h you'd have been 300ft past the intersection before the truck even reached it. :laughing





j/k.... good vid.
 

·
Registered
Joined
·
969 Posts
Good video and reminder. I was wondering though...reaction time is very important as well...

I assume that the speeds in the video are in mph. If the driver's reaction time in the vehicle travelling at 60mph is just a 1/4s slower than what was portrayed in the video, then he (theoretically) goes an extra 22 feet lodging his vehicle under the trailer unit.

Of course a slower speed will allow you more reaction time.
 

·
Registered
Joined
·
987 Posts
Your reaction time remains the same but the distance you cover during that reaction time obviously increases with added speed. So at a higher speed you travel a lot further before you actually get the brakes applied.

The video is in kmh.
 
1 - 20 of 39 Posts
Top