De magnetising/degaussing your car, bike ect?

[Crobbo]

I recently watched a discovery channel doco and they talked about inventions that changed the war.

Long story short the Germans were using mines that detected the magnetic fields of ships, but the British were able to avoid detection by running coils of wire around the ship, and from what I gathered tuned out the ships natural field.

Now what if this could be done to avoid detection from those loops embedded in the road.

Does this sound feasible or have I missed something, I'd be keen to know what you guys think of this.

[darkfibre]

The road loops are triggered by metal, not magnetic fields as far as I am aware.

[Shady7/8]

Even so... what loops are you trying to avoid?

You want to run red lights?

What are you trying to achieve in avoiding them?

[Barfridge]

The road loops are inductive.

Run a current through a wire loop, and it produces a magnetic field. Then when a moving metallic object moved through this field, it changes it, which also changes the current in the loop.

So you need a non-metallic, non-magnetic bike. Ceramics might work...

[Barfridge]

Even so... what loops are you trying to avoid?

You want to run red lights?

What are you trying to achieve in avoiding them?

He's sick of traffic lights changing for him, it's spooky how they know he's there.

[Crobbo]

He's sick of traffic lights changing for him, it's spooky how they know he's there.

Haha that's black magic that stuff.

It was one of those what if questions, but mainly to avoid speed traps.

It seems my suspicions were correct.

[Shady7/8]

Speed traps work on motion sensing technology - even the redlight camera ones.

Not many ways to jam them up

[Chewie]

Speed traps work on motion sensing technology - even the redlight camera ones.

Not many ways to jam them up

Don't move so fast?

And make sure you have your tinfoil hat on!

[Drasius]

Don't move so fast?

That's just crazy talk.

[Cam]

Speed traps work on motion sensing technology - even the redlight camera ones.

Not many ways to jam them up

[Shady7/8]

Radar jammer?

[Semi]

Speed traps work on motion sensing technology - even the redlight camera ones.

Not many ways to jam them up

No they don't, they use two inductance loops in the road. Theoretically, it may be possible to create an equal and opposite field around your bike to cancel the field, but its pretty damn impractical.

[Shady7/8]

Yes but no.

The trigger might be and inductive loop for red light cams, but the speed sensing is still the same as the Multanovas/Poliscan etc.
But in the light of the OPs intent yeah you would prefer to stealth over the inductive loops.

[Semi]

How sure are you of this? Where is the detecttor then? I'm pretty sure that the radar looking thing that sits near the camera is the flash, not the detector, because ed I've them go off.

[darkfibre]

Yes but no.

The trigger might be and inductive loop for red light cams, but the speed sensing is still the same as the Multanovas/Poliscan etc.

If you are correct, why is it that red light cameras have one loop cut into the road and when they convert them to speed cameras they add another two loops.

[Shady7/8]

I can only assume that they are to detect vehicles past the white line, a secondary sensor to determine an estimation of speed, and that they are indeed penetrating the intersection, and haven't simply overun the white a little (which is an offence too, that no one ever gets done for...).

Induction loops are simply not accurate enough to determine speed for infringement.

[darkfibre]

nope

The fixed red-light/speed systems record vehicle speed, take multiple digital photos of vehicles and capture video footage of the intersection before and after the offence.

Speed is detected using in-road sensors placed at a fixed distance apart and measure the time it takes a vehicle to travel between each sensor. If the sensors record that a vehicle's speed is greater than the posted speed limit, a photograph and video of the vehicle is taken.

Operators attend to sites to conduct testing regularly.

The new red-light/speed cameras have a two-fold purpose - they photograph motorists who contravene red traffic lights and also detect motorists speeding through the intersection at any phase of the lights.

[Shady7/8]

Well yes I can read that, but it doesn't say definitively.

Can you tell me that the inductive loops are accurate enough? They would be a trigger that speed is close enough or is above the limit, and the camera should snap and use it's inbuilt speed detection to get the accurate speed as it happy snaps.

If they are stupid enough to use inductive loops for 'accurate' speed measurement it opens all red light camera infringements open to contesting.

[darkfibre]

Well yes I can read that, but it doesn't say definitively.

Looks pretty clear to me;

Speed is detected using in-road sensors placed at a fixed distance apart and measure the time it takes a vehicle to travel between each sensor.

Considering an inductive sensor can trigger ignition at 20,000rpm, I would expect it to be precise enough if installed accurately

Edit; and no operator error.

[likefry]

Regardless, they still take two photos of your vehicle anyway to confirm the speed you were doing.

I dare say they have exact measurements of every intersection where those red light speed cameras are and know the timing on the two photos to work out your speed accurately. Wouldn't be hard to do and an easy way to check the induction coils