Paris in the snow, snow, snow ...

[dedeleco]

Siderante grelinette !!
http://www.youtube.com/watch?v=sKxy5Vst7Mo

This video shows that drivers have never driven on snow with all the idiocies and blunders not to do !!!!!!!!!!!!!!
And it is very dangerous risk of crushed pedestrian !!!
In particular the snow plow, on an almost horizontal surface (epsilon slope) blocks the wheels and panics by pressing like a brute on the brake without ever unlocking the wheels to stop much faster (snow flush like a bar of soap on a wheel). bathtub) !!
Secondly, instead of keeping the front wheels in the direction of the movement, it has turned all the way up so that it is impossible to catch up even by unlocking the wheels !!!
I would have shouted the driver like a rotten fish for not releasing the brake pedal !!
It has happened to me to see someone blocking the wheels and slipping for a long time to finish in my car back and yelling at him for not letting go of the brake pedal on a muddy road at a red light !!
I remember a case like a red light without snow with 5 cops looking and screaming louder than the sound of the wheels stuck out of the car slipping endless seconds and bumping into the car ahead at the stop of the red light (in addition impossibility to change direction to avoid) !!
Old remarkable memory !!
The worst is whenwe block the rear wheels, because the tail is immediate, what basic physics explains easily and what I invite you to find.

So
1) as soon as you skid while braking or releasing the throttle and the wheels lock, release the brake and unlock the wheels to stop without blocking the wheels and stop on a distance that can be 10 times shorter !!!
It's essential, release the brake, save you, and not only on the snow !!!
2) keep the front wheels in the direction of movement by unlocking the wheels, even if you do not feel like going where you want!

3) finally if stopped, we skate and we can not start, go back a little, to start and gain momentum, having checked that the front wheels are in the direction of the car !!.

Since this basic physics is not taught on the driver's license, I'm afraid of other drivers!

You can drive without snow tires as well yet !!

[Christophe]

The little pleasures of snow in an urban environment:
http://www.youtube.com/watch?v=sKxy5Vst7Mo

Very good video to propose to ... Video Gag

Siderante grelinette !!
http://www.youtube.com/watch?v=sKxy5Vst7Mo
This video shows that drivers have never driven on snow with all the idiocies and blunders not to do !!!!!!!!!!!!!!
And it is very dangerous risk of crushed pedestrian !!!
In particular the snow plow, on an almost horizontal surface (epsilon slope) blocks the wheels and panics by pressing like a brute on the brake without ever unlocking the wheels to stop much faster (snow flush like a bar of soap on a wheel). bathtub) !!

It is clear that the driver seems inexperienced (we do not steer like that under the snow) but ...

I think that the street was completely veined: with only snow, we do not slip with so much inertia at such a low speed ... especially a truck ... Also the audi makes move the 1ere car during the impact: unthinkable with only snow!

With audi 100 000 € it's expensive the skewer of cars ....

Come on, look at it an 3ieme time

ps: a special wiki article on the last winter http://fr.wikipedia.org/wiki/Hiver_2009-2010_en_Europe there will probably be the equivalent for this one ... seen as it goes!

[dedeleco]

I think the street was completely icy:

no, snow packed, because people do not fall out of their car!
Icy ice rink, we just got out of the car!

The, there was still usable grip without blocking the wheels!

I have experienced riding on 300km highway ice rink, thankfully less than one truck every 10Km !!
When leaving you hardly stand up !!

Snow is not needed, blocking the wheels, to turn a vehicle into a slippery bar, and without snow, many people died thus without understanding by blocking wheels, very often by road exit incomprehensible, especially blocking the rear wheels in a beautiful head to tail !!!!
In such cases, you have to let go of the brake, difficult with fear !!!!
The ABS does this in principle for you, but not always, according to settings, because the wheels are locked, barely the brake hit.

[Christophe]

Moue am not at 100% convinced ... there may be ice on the road and not on the sidewalks.

Example: in case of salting the street and not sidewalks then a redoux = the snow has melted and refrozen = ice on the road but not on the sidewalks ...

Or: recent salting of the sidewalks, not the street ...

Now, the well-packed snow does not look like ice: a dirty snowcatcher can make the situation worse ...

[moby25]

Looking at the video with the snow plow, we can not say either that it is a very slight slope, when we see the angle formed with the basement of the store in the background.

Ok, it's not a mountain pass but it does not go down well anyway

[gegyx]

It happened to me 2 years ago with the R21 (in the case since).
A subdivision street in a skate on the turn and a little before ...
Surprised, although at 30km / h, any maneuver impossible. The car leaves on the right, because of the bulge of the road.
I managed to grab the sidewalk right away. And the front rim folded right (surely something else too).
**
I also remember a ride without history on the fast track, 3 in the R5 boyfriend, then a coffee break on the road.
When we got out of the car, we all skidded on the road surface.

[Christophe]

I also remember a ride without history on the fast track, 3 in the R5 boyfriend, then a coffee break on the road.
When we got out of the car, we all skidded on the road surface.

Ah, it was you who inspired the board at Joe Bar Team?

It's not over: http://info.france2.fr/france/la-neige- ... 09424.html

In our country, Belgian side ardennes, 400m we have between 40 and 50 cm on the floor and 20 cm are planned for today.

In any case it allows to make beautiful photos

[dedeleco]

Looking at the video with the snow plow, we can not say either that it is a very slight slope, when we see the angle formed with the basement of the store in the background.

So if it's so slippery, how do you explain that cars go up just before without problems, people come out of cars to walk without falling?
In fact, it proves errors of locking of the wheels and rotation of the front wheels by uncontrolled fear and lack of anticipation !!

It is not easy to release the brake, since it is necessary to brake with a grip divided by 2 or 3 without sliding and which at the slightest slip is divided by 10 20!
As soon as there is the slightest slip, the coefficient of friction plummets and you slide like a bar of soap !!

My wife has slipped several times on wet or muddy roads and said, "there were no more brakes " and I had a lot of trouble admitting that the brakes were good, and that by pressing fear on the brake, panicked, the wheels were blocked and that the stopping distance is multiplied by 5 to 10 times to the point that we believe that there are no more brakes !!!
Even with ABS on the video audi quatro have gone into the sets because the wheeling of wheels very easy on snow is enough to make you go, even with ABS!

Many people died so not to have released the brakes even on normal road !!
Just about all the incomprehensible road exits on road without problems in my opinion (except sleep) !!!
This should be taught on the driver's license by driving a pseudo obstacle and forcing the brakes to release to prevent wheel lockup !!
The ABS does not protect against the lateral sliding of the wheels to catch up by putting the wheels in the direction of the movement, totally opposed to the desired direction often !!!!!! Very visible on the snow hunt !!!
Just like releasing the brake, you have to do the opposite of the normal reflex !!!!! Very very difficult without prior training including the physics of slippage !!!!!

[dedeleco]

gegyx lived:

It happened to me 2 years ago with the R21 (in the case since).
A subdivision street in a skate on the turn and a little before ...
Surprised, although at 30km / h, any maneuver impossible. The car leaves on the right, because of the bulge of the road.

An old R21 probably with weak dampers, and a bulge that makes take off a wheel (helped by weakened damper) that locks up and starts the sliding that continues without end !!
As soon as a wheel is blocked all maneuvering becomes impossible (the car becomes a bar of soap !!) and this sentence is characteristic of blocked wheels !!!
It is necessary to release the brakes totally and to press very very slightly !!!
Not easy if we hit the obstacle !!!! But it works!
All the more reason to anticipate as much as possible in advance !!!
If it's a locked rear wheel, we start an immediate spin !! for basic physical reasons couple forces !!
Even on a toy is very visible!

[Grelinette]

Go to make everyone agree, here is the data of the problem:

Let's assume that the shop window is 5 m long.
Calculate the angle of the slope.

You have 1 hour, after I pick up the copies.

(Anyway it's cold outside, so do some warm exercise!)