$peed camera$ - only in accident hot$pot$

[redden whites]

1. Do you have a reliable source for those figures?

A quick search will give you the info .I think it peaked at 390-400 in 72 or 73 before we became a nanny state

[locky801]

Thanks Sabre, no need for the collection, i admit i was doing 55 so got pinned, also admit i was even stupid because i heard on the wireless this morning that there would be a camera there and made a mental note of it knowing i would have to drive that section of road at few times today, so i have no excuse, but may well fight it in court, took some pics of the angle of the camera car etc and dont think it was really aligned to the kerb the way they should be to give an accurate speed

[redden whites]

LOL, I'm trying to work out if Psyber is Sam Newman, Fangio or Geoffrey Edelsten.

Sorry Psyber ... jokes, jokes, just jokes

Geez, I can't let that go without comment................pure gold.

[locky801]

1. Do you have a reliable source for those figures?

A quick search will give you the info .I think it peaked at 390-400 in 72 or 73 before we became a nanny state

Pretty well on the money Redden Whites, there were some horrific figures back in those days, even the early 80's we were up and around 250-300, even though back then the cars were stronger (but seemed to be faster) they had no safety devices as such, also these days i don't rely on SAPOL's figures for the Road Toll for reasons i will keep to myself, all in all though 1 road death per year is one road death too many but road education etc etc with alot having that attitude "IT WON'T HAPPEN TO ME" alot of the time it does

[CK]

Unfortunately, speed cameras are all too rare on the Southern Expressway. Put three on there in the mornings and three in the afternoons, and the Government will be able to pay for a four lane Expressway pretty quickly.

Nothing like that gust of wind buffeting the car as someone, arm out the window and with music at volumes that would deafen an elephant, either hurtles past you as a blur; overtakes you on the right hand side when you are already in the outer lane (yes, that's correct), or decides to see how close they can get to you before making contact behind you. Fortunately, many of them have mastered the art of driving without hands on the wheel, as they make copious gestures with one hand, while adopting this new and peculiar trend of driving with their left arm hanging over the back of the passenger seat (this trend spawned around the same time as stopping 6 feet+ plus behind drivers at traffic lights).

[redden whites]

Dead Right CK.I would have 20 permanently erected along the complete stretch both ways.

[Psyber]

1. Do you have a reliable source for those figures?

A quick search will give you the info .I think it peaked at 390-400 in 72 or 73 before we became a nanny state

Pretty well on the money Redden Whites, there were some horrific figures back in those days, even the early 80's we were up and around 250-300, even though back then the cars were stronger (but seemed to be faster) they had no safety devices as such, also these days i don't rely on SAPOL's figures for the Road Toll for reasons i will keep to myself, all in all though 1 road death per year is one road death too many but road education etc etc with a lot having that attitude "IT WON'T HAPPEN TO ME" alot of the time it does

I agree with what you said locky, and accept the figures have a valid source R&W.
But I contend it is too simplistic to blame every accident on speed - logically any moving car is at more risk than a stationery one and the faster one more so..
However,it is not that simple. Speed is convenient to blame because it is easy to make regulations about, and to police, and it makes money.
Policing the drunks and drug drivers and the dodgy unmaintained cars with poor tyres requires manpower and costs money.
So, it makes economic sense to put all the emphasis on speed.
I would like to see more money going into effective policing and proper [including in the sense of honesty] police officers than into events, politicians, spin, and grand-standing...
But those seem to be what wins elections - or at least our pollies think so.

[spell_check]

Not forgetting too there are still some improvements need to be made on roads - road widening, additional lanes, overtaking lanes, blind spots, re-laying bitumen for example.

[fish]

But I contend it is too simplistic to blame every accident on speed - logically any moving car is at more risk than a stationery one and the faster one more so..
However,it is not that simple. Speed is convenient to blame because it is easy to make regulations about, and to police, and it makes money.
Policing the drunks and drug drivers and the dodgy unmaintained cars with poor tyres requires manpower and costs money.
So, it makes economic sense to put all the emphasis on speed.
I would like to see more money going into effective policing and proper [including in the sense of honesty] police officers than into events, politicians, spin, and grand-standing...
But those seem to be what wins elections - or at least our pollies think so.

The authorities do not blame every "accident" on speed. However they have recognised that the severity of a collision, whether accidental or not, is almost always dependant on the speed at which it occurs. Remembering back to my high school physics I believe that the severity of a collision is dependant on the kinetic energy involved, which is proportional to the square of the speed involved. Thus a 10% reduction in speed means there is around 19% less energy involved. A 20% reduction in speed means there is around 36% less energy involved.

Thus a collision caused by a drunk or drugged or sober driver will be more severe (and will have more chance of happening) if it occurs at a higher speed than at a lower speed. Thus if speeds are limited by widespread enforcement of speed limits then we have a safer road environment regardless of the actual cause of "accidents".

[Psyber]

Are you referring to the formulae: v-squared = u-squared + 2as, F=ma, [and s = ut + 1/2 a t-squared]?
Where F = force, v = final velocity, u = initial velocity and s = distance, m = mass, a = acceleration, and t = time.
[IIRC - I finished my physics education in 1962.]

From the first two we can derive: Force F = mass times [v-squared - u-squared divided by 2as]
For braking we apply a negative acceleration factor.

I think I got that right - please check and correct me if need be....

[fish]

Are you referring to the formulae: v-squared = u-squared + 2as, F=ma, [and s = ut + 1/2 a t-squared]?
Where F = force, v = final velocity, u = initial velocity and s = distance, m = mass, a = acceleration, and t = time.
[IIRC - I finished my physics education in 1962.]

From the first two we can derive: Force F = mass times [v-squared - u-squared divided by 2as]
For braking we apply a negative acceleration factor.

I think I got that right - please check and correct me if need be....

Jeepers Psyber you lost me at "formulae"

I was recalling the equation Kinetic Energy = half x mass x speed squared.

[dedja]

dedja's theorem:


drunk driver + fast car =

QED

[Psyber]

Jeepers Psyber you lost me at "formulae"
I was recalling the equation Kinetic Energy = half x mass x speed squared.

Ah, I think that would come from another derivation from the basic formulae above:
F= 1/2 x m x [v-squared - u-squared divided by s] - the bit in [] giving you an average squared speed over whatever distance you selected.

Oh.. and I made an error - my physics education ended in 1964.

[mal]

Love them or hate them
Speed cameras have done one thing to me
Made me drive slower

Yes I get frustrated getting pinged in an insignificant spot
But the message has got thru to me, they could be anywhere and everywhere
That makes me drive slower

[oldfella]

Just a little table that indicates how long it takes to travel 1km at various speeds (sorry hard to read).

10k @ 60 against 10km @ 50 is a difference in travel time of 2 minutes?

10km @ 100 against 10km @ 80 is a difference in travel time of 90 seconds

Speed 60 min Time per Km (min) Seconds Length of section Actual travel time
50 60 1.2 72 1 72
60 60 1.0 60 1 60
70 60 0.9 51 1 51
80 60 0.8 45 1 45
90 60 0.7 40 1 40
100 60 0.6 36 1 36
110 60 0.5 33 1 33

[Jimmy_041]

Dead Right CK.I would have 20 permanently erected along the complete stretch both ways.

as well as pinging anyone who sits in the right hand lane for more than 1km

Have some consideration - move over - just because you have to take a right turnoff in the next 5 kms doesn't mean you have to sit in the right lane for the entire journey.

All it does is make other drivers do stupid things to either get around you or let you know what an inconsiderate.....................

[Psyber]

Dead Right CK.I would have 20 permanently erected along the complete stretch both ways.

as well as pinging anyone who sits in the right hand lane for more than 1km
Have some consideration - move over - just because you have to take a right turnoff in the next 5 kms doesn't mean you have to sit in the right lane for the entire journey.
All it does is make other drivers do stupid things to either get around you or let you know what an inconsiderate.....................

On the SE Freeway section where there are three lanes there seem to be a lot of people who sit in the middle lane of the and drive below the speed limit, something I don't recall seeing on similar roads in Melbourne.
As near as I can work out they seem to do it because they are worried about being stuck in the left lane behind trucks and not being able to get around them.
Is this related to the SA pattern of accelerating to stop people changing lanes ahead of you when they indicate, or is there something more arcane I don't know about?

[dedja]

LOL, I'm trying to work out if Psyber is Sam Newman, Fangio or Geoffrey Edelsten.

Sorry Psyber ... jokes, jokes, just jokes

Is this the real Psyber???

[Psyber]

LOL, I'm trying to work out if Psyber is Sam Newman, Fangio or Geoffrey Edelsten.
Sorry Psyber ... jokes, jokes, just jokes

Geez, I can't let that go without comment................pure gold.

You can eliminate Geoffrey - I'd never go for a tart like that...

[aceman]

LOL, I'm trying to work out if Psyber is Sam Newman, Fangio or Geoffrey Edelsten.

Sorry Psyber ... jokes, jokes, just jokes

Is this the real Psyber???

And that's probably Boozehound writing out the ticket