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Mobile Speed Cameras

butch

By butch,
in New South Wales

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wht510
wht510

Back to school for you guys I'll try and explain it to you guys It's based on momentum and impulse energy. Forgive me if it all starts getting too complicated. Momentum is mass times velocity. So

Posted Images

wht510 Experienced

wht510

Posted
Posted

Can you prove it? Or did you want me to using engineering physics?

Anyway, this thread isn't about whether you want to have a head on or not. It's about Mobile Speed cameras in NSW. So I suggest we get back on topic. Although this has been fun :happy:

Daleo Grand Master

Daleo

Posted
Posted

Thanks wht510 for the physics lesson :worship: I was sure that was the case, but your explanation was awesome.

Big brain FTW!

I wonder if some of the misconception is down to the difference in DeltaV; due to the lack of crumple zones in a wall, versus the perceived relative "softness" of a car?

GTR-N1 Grand Master

GTR-N1

Posted
Posted

It was the same when i was in Adelaide about 2 months ago.Every body was doing 10 k's under the limit everywhere.It was infuriating. I thought:These cops have really got these drivers shitting themselves.

^ ^ ^ must be similar to Rockhampton.

Coppers were setting up a radar unit quite close to the approaches to the main Bruce Hwy bridge.

The crassness and insensitivity of it all was, they were doing it as Rockhampton was about to be submerged - yes, the flood! :down:

MBS206 Grand Master

MBS206

Posted
Posted

This is the worst sort of driver IMHO. The person who thinks they know it all, thinks they have experience because they fanged someone elses car around motorkhana (not caring for the car because it's not yours?)

Then you say there's no room for these skills on the road....... "except in an emergency" - which would I would hazard a guess and say there is room for skills like these on the road.

Driver training/track work/motorkhanas etc. etc. etc. isn't going to save you when you aren't concentrating. You aren't invincible because you are driving below the speed.

There's no need to know how to drive on a car on the limit, or how to slide them around, IF you drive to the conditions, you should never be on the edge of "Sliding out". If you drive with enough observation, you will not end up in dangerous situations, such as having to brake heavily because of stupid people pulling out etc.

As to "fanging someone elses car". I went up to help out, as my car was off the road. A friend offered me the keys, and her car drives totally different to mine. As an experienced veteran of the road, I'm sure you'd agree that going from one car to another, even when it's the same model, with relatively the same mods, the cars drive differently... ;)

But still, we come to the fact, as Cassbo has said, if you overstep the line in the sand. It's YOUR FAULT. Deal with it.

If you've got such a huge problem with it, stop bitching on the internet, and get yourself into a career path that will make a difference in these rules... Or is it too easy for you to complain instead and you just CBF like the rest of the people who just want to have a whinge without doing anything productive?

saliya Rising Star

saliya

Posted
Posted (edited)

sorry dude i just assume averyone on here is a it nerd ( mainly just to rub them up the wrong way)

each vehicle only has a 80km/h of energy so total energy from the crash from both cars= about half of teh same car doing 160km/h

crash a car into a wall at 80km/h

crash two cars head on into each other both doing 80 km/h and the damage is almost the same

so it only = 80 km/h

Fatz is right:

energy is proportional to the square of the velocity at the speeds we're talking about.

double the velocity = 4x the energy to dissipate assuming same mass.

Let's give an 80km/h car an energy of 1 unit.

1 x 80km/h car hitting solid object = 1 unit of energy to dissipate in its crumple zone

2 x 80km/h cars hitting each other = 2 units of energy to dissipate in each car's crumple zone, say 1 each = similar to solid object impact for 1 80km/h car

1 x 160km/h car hitting solid object = 4 units of energy to dissipate in 1 car's crumple zone = a way bigger dissipation than 2 x 80km/h.

Back on topic:

As part of the motorcycle training all riders must do a video is shown of a station wagon hitting a solid concrete block head on at 80km/h.

If you were in that wagon (regardless of restraints or airbags) you would be dead. The car ends up being about 1/2-2/3 its original length.

If a 'safe' travelling speed = a speed at which a solid impact is survivable from inside the car, then that 'safe' speed is more like 45km/h...

Given that the figures actually show 'speed differential' (i.e. how different your speed is to those travelling around you) is the problem,

I would like to see "speed recommendation" rather than "speed limit" signs; then fining people according to how far off that "speed recommendation" they are.

e.g. if the recommended speed is 100, and you're doing 130 (or 70) you should be fined the same.

Cheers,

SW

Edited by saliya
wht510 Experienced

wht510

Posted
Posted

Yes you are right.

Depends on whether you wish to say that the 'crumple zones' are negligable, which I was assuming. At those speeds, it's game over anyway the crumple zones are just a token. Most of the kinetic energy isn't absorbed by the crumple zone, but the occupants and the car itself. Eitherway, Kinetic energy and momentum are the right way of figuring this stuff out.

I'm spent (driving on the right side of the road over in the good ol' US of A. Where the limit is 55, but everyone does 70!)

Peace out. Jet lag is speaking.

Bourbon Boy Community Regular

Bourbon Boy

Posted
Posted

On Topic: Honestly, I havent seen even one of these mobile cameras.

I've seen more parked police with radars but no big Ford Territory's as was romoured.

Off-Topic: Last week some crazy copper on Parramatta Road crossed two lanes with his head down in peak hour traffic holding a radar (which looked like a gun) and no stop sign. So he gave everyone (me) an impression he was just crossing the road. When he gets to the middle of my lane he decides to look up and stop two whole lanes. Mind you I was still doing 70kph and he was less than 50m away. I shit my pants. I thought he was busting me. I was in the inner lane. He let through two cars on the outer lane then busted a dude in a blue Mitsubishi in the outer lane. Phew!... But come on!! The cop could of caused a pile up and put himself in danger! He could of at least flagged everyone to slow down first!

So yeah. Havent seen any mobile cameras: knock on wood.

Nee-san Grand Master

Nee-san

Posted
Posted

^ ^ ^ must be similar to Rockhampton.

Coppers were setting up a radar unit quite close to the approaches to the main Bruce Hwy bridge.

The crassness and insensitivity of it all was, they were doing it as Rockhampton was about to be submerged - yes, the flood! :down:

Have nothing but respect and admiration for most of the QPS and it's personel but the traffic branch are an absolute bunch of dogs and oxygen thieves.

GTR-N1 Grand Master

GTR-N1

Posted
Posted

Have nothing but respect and admiration for most of the QPS and it's personel but the traffic branch are an absolute bunch of dogs and oxygen thieves.

They surely don't hide...

* behind trees do they?

* or silhouetted by sunsets?

* behind Century 21 F/S signs?

* between parked cars?

* under the veil of moonless nights?

* 20m past an apex?

Sounds like NSW & VIC!

Alas, I guess catching 'speedsters' fleeing from floods takes the cake!

Witnessed by FineLine.

Daleo Grand Master

Daleo

Posted
Posted

They surely don't hide...

* behind trees do they?

* or silhouetted by sunsets?

* behind Century 21 F/S signs?

* between parked cars?

* under the veil of moonless nights?

* 20m past an apex?

Sounds like NSW & VIC!

Alas, I guess catching 'speedsters' fleeing from floods takes the cake!

Witnessed by FineLine.

Sounds like someone who knows my mate the HWP officer in the red (and now also a green) unmarked VE on the GWH, eh Terry?

Add illegally parked in Everton Road (Ugg Boot Man) blocking traffic from exiting an intersection.

My missus sat behind him the other day (he's parked AT the dotted line at the corner, and looks like he's about to pull out and drive down towards Springwood), eventually tooting at him, until he got out of his car and impatiently told her to drive around him.

She then asked him sweetly what the minimum parking distance from a corner was. She said he went red and started mumbling... :spank:

She said "speak up please" as he was muttering and walking away

Nearly wet myself when she told me...

hamiltonau Grand Master

hamiltonau

Posted
Posted

My missus sat behind him the other day (he's parked AT the dotted line at the corner, and looks like he's about to pull out and drive down towards Springwood), eventually tooting at him, until he got out of his car and impatiently told her to drive around him.

She then asked him sweetly what the minimum parking distance from a corner was. She said he went red and started mumbling... :spank:

She said "speak up please" as he was muttering and walking away

CSB, cool story bro!

mines not as good but..

mate at work lives up near epping, forget the road but basically a cop was using his driveway to do radar checks as he lives just after a blind corner, soon as my work colleague realised what was going on he marched out and told them to take a hike. They tried to convince him they were just doing their job but he just told them to 'f**k off and do it somewhere else.'

gold.

MaTBoY Grand Master

MaTBoY

Posted
Posted

Sorry, I'm marching in a bit late here... but 2 car head to head impacts don't need crumpled zones. It's simpler than that. You 2 cars, so twice the mass to soak up the impact.

Energy = half x mass x velocity squared.

P.s. mobile cameras are gay.

Daleo Grand Master

Daleo

Posted
Posted (edited)

My missus sat behind him the other day (he's parked AT the dotted line at the corner, and looks like he's about to pull out and drive down towards Springwood), eventually tooting at him, until he got out of his car and impatiently told her to drive around him.

She then asked him sweetly what the minimum parking distance from a corner was. She said he went red and started mumbling... :spank:

She said "speak up please" as he was muttering and walking away

CSB, cool story bro!

mines not as good but..

mate at work lives up near epping, forget the road but basically a cop was using his driveway to do radar checks as he lives just after a blind corner, soon as my work colleague realised what was going on he marched out and told them to take a hike. They tried to convince him they were just doing their job but he just told them to 'f**k off and do it somewhere else.'

gold.

http://www.speedingf...onsultants.com/

"Radar must not be used at any location or in a mode that would give rise to legitimate adverse criticism or a complaint that radar is a means of raising government revenue"…..

This is particularly true of legislated safety procedures the police are supposed to carry out whilst engaged in speed enforcement operations. Just as a sample did you know that when you are pulled over by a policeman using a Lidar/Laser gun, the following rules must be adhered to by that policeman. It states clearly and I quote; "At all times a fully marked Police vehicle is to be positioned on the roadway at the stopping location to provide early warning and a corridor of safety for motorists. The roof message bar and/or warning lights of the police vehicle must be utilised." When was the last time you saw that happen? They hide behind bushes and bustops, park their vehicles around the corner or up on the footpath behind those bustops creating havoc for pedestrians, use unmarked vehicles and deliberately operate from the reserves in between major freeways. They hide up elevated off ramps, in road works, in fact everywhere their own laws declare they are not allowed to operate in!

Driveways and side streets are NOT part of the "Stopping Location" criteria and therefore not legitimate.

If it was my driveway, I'd park the F##ker in and catch the train to work for a week.

Edited by Daleo
Daleo Grand Master

Daleo

Posted
Posted

go ask a legal person what a guideline is

lol

Exactly, and that's why they do it :thumbsup:

But it also means you might have a chance of getting off if they've taken the piss badly enough...

You're Mountains too, right?

GTR-N1 Grand Master

GTR-N1

Posted
Posted

Sounds like someone who knows my mate the HWP officer in the red (and now also a green) unmarked VE on the GWH, eh Terry?

Add illegally parked in Everton Road (Ugg Boot Man) blocking traffic from exiting an intersection.

My missus sat behind him the other day (he's parked AT the dotted line at the corner, and looks like he's about to pull out and drive down towards Springwood), eventually tooting at him, until he got out of his car and impatiently told her to drive around him.

She then asked him sweetly what the minimum parking distance from a corner was. She said he went red and started mumbling... :spank:

She said "speak up please" as he was muttering and walking away

Nearly wet myself when she told me...

Hmmm... still in the Blue Mtns Dale & fatz,

It's taking the RTA forever and a day to fix up the Old Bathurst Rd between E. Blaxland and Emu Hts.

The speed limit has been restricted to 40Km/hr.

So what does Mr Plod do?

He parks his red/green VE in Binya Ave near the top of the escarpment 15m from the speed-reduction sign, and lies in wait.

There isn't one intersection, driveway, house, outhouse, farmhouse or doghouse from where he sits to below the scraped section.

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