Police killing us again!

[Katman]

It's less than 120m if the obstacle is reversing towards you.

Don't make me laugh. A three-point turn doesn't involve any more than a few metres backward movement from the point at which it's executed.

[Katman]

and what you have there is an average reaction chart, but a determined reaction time chart, I said surprise reaction like the one where you come over a brow & see a PIG your road not a determined one like when a guy sits next to you and yells "stop"

And are you telling me it takes you 2 seconds (count them - 1 one thousand, 2 one thousand) between you thinking "Fuck!!!" and hitting the brakes?

[quickbuck]

well ACC propaganda says in 3 secs @ 100km/h you can drive a rugby field (100m) your saying there was 120m so that would be covered in 4secs @ 100km/h now take out 2 secs for avg human surprise reaction you have 2secs left.

Um, the whole point of putting on the brakes is to slow down. This means the time you have left actually increases exponentially. (Speed = Distance covered / time taken).

If I saw a big while car with blue writing on it in the middle of the road, i would hope my reaction time to get on the brakes would be closer to 0.2 seconds, not 2 full seconds. (okay, even if I was half asleep, 0.5 seconds).
If not, I should hang up my leathers.

[FJRider]

The TV3 news report ... Take a look at the road ...

http://www.3news.co.nz/Motorcyclists...7/Default.aspx

[blueblade]

So we should ignore the stupid actions of police officer's unless they can kill enough of us to exceed the numbers of motorcyclists that kill themselves? Maybe the police should also ignore all traffic offences other than the one or two most likely to cause death of injury, because all the rest aren't nearly as important?
I don't understand the logic behind your reasoning so I'll just say: "what the hell?"

And exactly where did I say we should ignore the actions of the Police?? Try reading and understanding my entire post and you might have more chance of understanding my logic.

My point being we would save more lives if we could do something about a lot of motorcyclists attitudes to road safety than we would by doing something about Police behaviour. That does not mean I believe we should do nothing about Police behaviour - that is clearly something that also needs addressing.

[Scuba_Steve]

And are you telling me it takes you 2 seconds (count them - 1 one thousand, 2 one thousand) between you thinking "Fuck!!!" and hitting the brakes?

Um, the whole point of putting on the brakes is to slow down. This means the time you have left actually increases exponentially. (Speed = Distance covered / time taken).

If I saw a big while car with blue writing on it in the middle of the road, i would hope my reaction time to get on the brakes would be closer to 0.2 seconds, not 2 full seconds. (okay, even if I was half asleep, 0.5 seconds).
If not, I should hang up my leathers.

this is just avg times based on studies .5 is avg time for a "known" reaction 2 secs for a "surprise" reaction, many things make up this reaction time & it is NOT an absolute it is an avg. I think what you are forgetting is the brain is a computer & it speeds things up by "expecting", when something "unexpected" happens your brain has to do a complete recalculation this takes time, an avg of 1.5 secs more according to the studies.

[Scuba_Steve]

The TV3 news report ... Take a look at the road ...

http://www.3news.co.nz/Motorcyclists...7/Default.aspx

I just watched that so where da fuck is this 120m coming from??? da PIG was 70m away from the top, taking the time at 100km/h to about 2 secs reaction to stop.

[blueblade]

Perhaps it has something to do with the fact that both the cop car and the motorcyclist have height above the road surface and therefore line of sight is extended to the said 120m

[Katman]

Perhaps it has something to do with the fact that both the cop car and the motorcyclist have height above the road surface and therefore line of sight is extended to the said 120m

Don't be ridiculous.

What would physics and geometry know?

[bogan]

Don't be ridiculous.

What would physics and geometry know?

Speaking of which, what was the incline on the road? It plays a rather large part in stopping distance.

[Katman]

Speaking of which, what was the incline on the road? It plays a rather large part in stopping distance.

Nice try.

Incline and the profile of the brow become extremely pertinant factors in stopping distances as speed increases significantly.

There would be very little influence over suspension or braking coming over that brow at 100kph.

[bogan]

Nice try.

Incline and the profile of the brow become extremely pertinant factors in stopping distances as speed increases.

There would be very little influence over suspension or braking coming over that brow at 100kph.

Nice try at what? Educating people about stopping distance factors is all I was hoping for. Too much to hope for?

Depends on the brow (and subsequent incline) doesn't it, which brings up another point, a changing incline also changes stopping distance.

[Kendog]

The TV3 news report ... Take a look at the road ...

http://www.3news.co.nz/Motorcyclists...7/Default.aspx

And some of the comments show what people think of motorcycles

The NZ Police rock, the motor cyclist doesn't. To the cop who did the U turn, it wasn't your fault mate, that motor cyclist was a risk to all other road users. Fin

[Scuba_Steve]

Perhaps it has something to do with the fact that both the cop car and the motorcyclist have height above the road surface and therefore line of sight is extended to the said 120m

I don't know this hill so I can't comment too much, but experience tells me theres usually always a 'black spot' when coming over a hill & it's quite surprising what can appear from "a clear road"

[tnarg]

And are you telling me it takes you 2 seconds (count them - 1 one thousand, 2 one thousand) between you thinking "Fuck!!!" and hitting the brakes?

The reaction time debate is not as simple as you make it out to be. 2 second reaction time for coming over a brow and seeing obstacle is very probable.
A copy paste for you.

Surprise vs. Reaction Time
The best research done on the affects of surprise on reaction time is by Dr. Marc Green. He has been studying the concept of reaction time for over 34 years. In one of his articles he discusses the difference between reaction time when the event is expected, or in a security scenario could relate to a driver who has done a route survey and knows the danger zones on the route, and when the event is a surprise which could relate to an inexperience driver, or a drive who has not done a route survey. As an example, when the driver knows they have to brake they can achieve the best possible reaction time. Dr Green says that the best estimate is 0.7 seconds. Of this, 0.5 is perception and 0.2 is movement, the time required to release the accelerator and to depress the brake pedal.

When the need to brake is a complete surprise reaction time is substantially different. In this case Dr. Green suggests that the best estimate is 1.5 seconds for something that may be coming at you from the side and a few tenths of a second faster for straight-ahead obstacles. Surprise creates a perception time of 1.2 seconds and a movement time of 0.3 second.