Biker with 14yr old pillion - 122mph

900Ft stopping. Hmm. Doubt that some how. heh.

There is no way that was 122, and what was the error message on the display just before the speed was flashed up, anyone with any experience on operating these machines have an opinion?

Havent watched the video, I cant condone those speeds but ffs... really, is he liley to do it again... no probably not.. give him points and a heavy fine..send the fine to me and everyone is happy.

Prison...ffs

I'm sure they would have used, in court, any reason at all to ridicule the speed camera reading so it must be correct, but it sure don't look it to me. And what about all the traffic coming the other way, wouldn't that have confused the reading?

I remember in 1986 when I had an FJ100 taking my 8 year old daughter on the back and reaching speeds in excess of those quoted. On a private road of course.

Like I say to anyway who asks, " I don't want to crash, one or two up. So why should I ride any differently when I am two up?"

if that was 122 then Im good looking

coming off at any speed would hurt. I doubt very much he was riding recklessly or dangerously with his kid on the back. I know when I take my son pillion and we are on a nice straight road or quiet motorway I open it up (at his request). Im not doing it to be dangerous, if we come off at 100 it will hurt as much as if we come off at the legal 70. But you cant ride your bike constantly thinking I better not do that I may come off.

[G]

II have never been much over 100mph wih a pillion on purely because if I did have to break hard it would not be comfortable for the person on the back.

When I first read the title I thought it was a pete and lissa spotted thread

(Runs and hides)

error 03 means the operator was aiming the device badly ("Unstable reading due to poor aim or panning off of target"), which is fairly obvious from the photos; the cross hairs flip from one side of the car to the other and at no point appear to actually target the car itself. Presumably the device has to measure a distance moved over a period of time to establish speed; are the frames between the recorded error and the speed reading sufficent to establish a speed?

Originally Posted by ThEGr33k

900Ft stopping. Hmm. Doubt that some how. heh.

900ft is about right for a full stop braking consistently at a little over 0.5G (5m/s/s 11mph/s) constantly which would be appropriate for a MC on road tyres and a wet road. If you throw in reaction time after identifying a threat and less than efficient braking it could be a lot further. It is that initial reaction time that is the most critical in any emergency stop. 180ft for a risk identification, assessment and reaction - that assumes one second for the whole process. The reality is more likely to be closer to three times that. Getting the bike from open throttle to stabilised maximum braking effect takes time to, something that you do not have too much of when hurtling down a busy road at 180ft/s.

To bring the bike to a full stop, 900ft is undisputable.

v^2=u^2+2as => s=(v^2-u^2)/2a (O level physics stuff if we were paying attention) where v is the initial velocity in ft/s or m/s, u is the final velocity, a is acceleration in fts^-2 or ms^-2, s is distance in ft or m. 1G = 9.8ms^-2 or ~32fts^-2. v=mph*5280/3600 ft/s or v=kph*1000/3600 m/s. Just keep the units straight.

Assume 0.5G = 16fts^-2
122mph is 122*5280/3600=179ft/s
s=(v^2-u^2)/2a =(179^2-0^2)/2*16 =1000ft
0.6G would have given 834ft.

Anyone who thinks that one, they can accurately judge the speed of a vehicle moving away from or towards them, and two do the same from a video is kidding themselves. FWIW, that bike did not look to be doing 120mph in that clip to me either.

I couldn't care less how someone rides when on their own, but if that had been my kid on the back of his bike then a prison cell would have been the least of his worries. The court reacted appropriately.

Cheers

The kid looked to be wearing protective gear.

The copper stating 900ft stopping distance is quoting from the outdated stopping distances in the highway code. Since then, all vehicles produced have been made with brakes capable of shortening that stopping distance.

The camera is laughably inaccurate, but as Pete said, that would (or should) of been argued in court.

It doesn't look like 120mph to me, but the guy has admitted it.

He got caught speeding, he's accepted the fact he was speeding. The fact he had his son on the back should have no baring on the case.