Can 3 bikes get clocked by radar?

[FJRider]

Still, never let the facts get in the way of a good grizzle. Come on FJR, you can do better than that.

I usually try to have an element of truth in my troll's ... but it's been a long day.

Same for you I guess .... ???

[rastuscat]

I usually try to have an element of truth in my troll's ... but it's been a long day.

Same for you I guess .... ???

Yup, always trolling for a reaction late in the day to set up my evenings entertainment

Thanks for the opportunity to bite

[Akzle]

Carefull fella .. he might post another pic of a male displaying his genitals ... it seems to be his "thing" ...

no figgy jam, that was just for you. as the content of your posts is basically floppy cock. at least rastus has a position and the mind to defend it, rather than running to google for his opinion.

[Jantar]

...Cosine angle effect would escape most these days, as would Doppler shift. Tracking history just doesn't get the attention it should.

.

And as a motorcyclist I am happy that the recruits don't get a better understanding of the Cosine law. Yet I fail to understand how anyone with even level 1 NCEA maths wouldn't find it intuitive. However some extra training on tracking history, side lobes, angles of reflectivity, etc. would be appreciated.

[FJRider]

no figgy jam, that was just for you. as the content of your posts is basically floppy cock. at least rastus has a position and the mind to defend it, rather than running to google for his opinion.

I'll quote any source that has an opinion ... or explanation that differs from yours ... not JUST Wiki.

Because you're always wrong.

[Akzle]

...(flacid penis)

case. in. point.

[Berries]

If there was a quota I could fill it everyday without even turning a radar or laser on. I reckon I could fill a quota with simple indicating tickets, stop sign tickets, lots that are less drama and are more lucrative than speed tickets.

Tell, me, how far can you ride without seeing and obscured number plate? Easy to prove, worth lots, but hardly ever written.

Why not?

Ok, it is not a crash causing offence, but then neither are 99.9999% of speeding offences. Failing to indicate actually causes crashes. There is some odd logic going on here. I guess obscured number plates will only become a priority when the speed cameras can't read them.

[davereid]

Thank you. Cosine is not much of an issue unless the radar is moving anyway, until then it helps the person being tracked. More like things that creep into badly surpressed side lobes etc... About the cosine: What you really need is a DGPS based system to tell the radar it's own speed. Then we'd be fucked. Until then it's fairly easy to explain to the judge, why the ticket shouldn't stand.

Cosine effect can work against the motorist, its a basic vulnerability of slant radar (like camera) systems.

If the speed cam van is not parked perfectly parallel to the path of the tracked vehicle it will miscalculate the speed every time.

Police can try and park the van parallel to the road, but they cant control the path of the vehicle.

For example if a motorcyclist is moving from one side of the lane to the other, the speed camera will get it wrong.

[rastuscat]

Cosine effect can work against the motorist, its a basic vulnerability of slant radar (like camera) systems.

If the speed cam van is not parked perfectly parallel to the path of the tracked vehicle it will miscalculate the speed every time.

Police can try and park the van parallel to the road, but they cant control the path of the vehicle.

For example if a motorcyclist is moving from one side of the lane to the other, the speed camera will get it wrong.

Interesting that you should raise that, 19 years after cameras were introduced.

It was used as a defence back when they started, and was dismissed by the courts.

The practical variation in the path of a vehicle as it crosses a slant radar beam makes so little difference as to be insignificant. The variation is defeated by a 0.5 degree tolerance built into the radar alignment. So, there is a tolerance on the speed limit, then a minor tolerance on the camera alignment. I'd say that's fairly tolerant, and that anyone who gets caught is certainly breaking the rules.

Great urban myth to revive, though.

[Jantar]

.....

For example if a motorcyclist is moving from one side of the lane to the other, the speed camera will get it wrong.

If the motorcyclist's slant angle is steep enough to affect the reading then either the motorcyclist is going very slow, so no problem, or the motorcylist is about to leave the road.

Take a rider travelling at 100 kmh on the open road, and is angled across his lane at only 8 degrees towards the camera. The speed camera will read 101 kmh, but the rider will completely cross his lane and be off the road in 0.28 seconds.

Cosine error will almost always work in the motorist's favour.

[Hans]

Cosine effect can work against the motorist, its a basic vulnerability of slant radar (like camera) systems.

If the speed cam van is not parked perfectly parallel to the path of the tracked vehicle it will miscalculate the speed every time.

Police can try and park the van parallel to the road, but they cant control the path of the vehicle.

For example if a motorcyclist is moving from one side of the lane to the other, the speed camera will get it wrong.

See the part where I said it's not much of a problem. Since this thread deals with police officers and multiple bikes, I thought it was pretty safe not to discuss cameras. You'd have to get into some pretty exotic stuff to have cosine effect work against the motorist in any other stationary radar scenario. I'm trying to think of a realistic situation and I'm having trouble coming up with one.

It's all the other factors that you need to be worried about.

[scumdog]

Cosine error will almost always work in the motorist's favour.

But it's one of those things motorist comment on as being 'unfair' - go figure...

[Hans]

But it's one of those things motorist comment on as being 'unfair' - go figure...

Unless, of course, they happen to get snapped by a moving radar. Then it's a different story altogether. Tell me, how do you know what the radar unit used for an own speed reading?

[Akzle]

Unless, of course, they happen to get snapped by a moving radar. Then it's a different story altogether. Tell me, how do you know what the radar unit used for an own speed reading?

aren't they sync'd to the poopoo wagons? labelled something like "control vehicle speed"?

[doc]

That's why when riding in groups if one rider gets rolled then the other ones should take off, and the victim should declare no knowledge of the other riders details.

Yep thats the way to go. We were travelling in a group and pulled over a little way ahead because the lead bike stopped when signalled by Mr Policeman. He came over and asked to see our paperwork. Then gave us all tickets. After numerous communications by letter we didn't have any way out. "We were travelling as a group" Zero tolerance to speed etc.. Not worth the effort to take time off work to travel down and fight it. Only 80 bucks, but we don't all stop anymore, just wait in the next town.