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Post by Deleted on Mar 8, 2019 21:24:18 GMT 1
That thing in the instrument display that you look at to assess how fast you are going. valhalla should know different Odometer records mileage on a wheeled vehicle. And... A speedometer displays the vehicle speed. I have been wrong about a lot of things in my life. But Guardian... I doubt if this will be one of them? Sorry to burst your bubble, but you are wrong beyond all doubt I'll give time for valhalla to reply
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remmington
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Post by remmington on Mar 8, 2019 21:31:14 GMT 1
Definition of speedometer in English: speedometer NOUN An instrument on a vehicle's dashboard indicating its speed.
Example sentencesSynonyms Pronunciation speedometer/spiːˈdɒmɪtə/
Quote ex the Oxford dictionary
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Post by Deleted on Mar 8, 2019 21:40:22 GMT 1
Not good enough, that is written for the lay person to understand not the professionals. The street signs were agreed for the lay persons to have a basic understanding of vehicle movement, however, it is incorrectly understood to say that a vehicle is travelling at a speed of say 30 mph, and then refer this to vehicle speed. Surely you can see where I am coming from here, but if not don't worry after valhalla has been back on and past comment all will be revealed
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remmington
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Post by remmington on Mar 8, 2019 21:48:29 GMT 1
Not good enough, that is written for the lay person to understand not the professionals. The street signs were agreed for the lay persons to have a basic understanding of vehicle movement, however, it is incorrectly understood to say that a vehicle is travelling at a speed of say 30 mph, and then refer this to vehicle speed. Surely you can see where I am coming from here, but if not don't worry after valhalla has been back on and past comment all will be revealed No mate - I have not got a clue? - to what point you are trying weakly make (or really what you have to gain by making it?).I spend allot of my working week - fitting and calibrating tachos and hackney taxi meters - dealing with the measured mile. Speed = distance / time.
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Post by givusaclue on Mar 8, 2019 21:57:40 GMT 1
Not good enough, that is written for the lay person to understand not the professionals. The street signs were agreed for the lay persons to have a basic understanding of vehicle movement, however, it is incorrectly understood to say that a vehicle is travelling at a speed of say 30 mph, and then refer this to vehicle speed. Surely you can see where I am coming from here, but if not don't worry after valhalla has been back on and past comment all will be revealed Careful now, to be superior to us mere mortal “lay people “ you need to improve your grammar & spellings, otherwise you won’t achieve your desired effect.
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Post by Deleted on Mar 8, 2019 21:57:46 GMT 1
Not good enough, that is written for the lay person to understand not the professionals. The street signs were agreed for the lay persons to have a basic understanding of vehicle movement, however, it is incorrectly understood to say that a vehicle is travelling at a speed of say 30 mph, and then refer this to vehicle speed. Surely you can see where I am coming from here, but if not don't worry after valhalla has been back on and past comment all will be revealed No mate - I have not got a clue? - to what point you are trying weakly to make (or really what you have to gain by making it).I spend allot of my working week - fitting and calibrating tachos and hackney taxi meters - dealing with the measured mile. Speed = distance / time. Yes but Speed = distance / time can be thought of as equal to MPH, but speed is not displayed by the vehicles speedo in a vehicle. All the evidence you need is looking at you in this sentence, and on every instrument display.
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Post by Deleted on Mar 8, 2019 22:00:13 GMT 1
Not good enough, that is written for the lay person to understand not the professionals. The street signs were agreed for the lay persons to have a basic understanding of vehicle movement, however, it is incorrectly understood to say that a vehicle is travelling at a speed of say 30 mph, and then refer this to vehicle speed. Surely you can see where I am coming from here, but if not don't worry after valhalla has been back on and past comment all will be revealed Careful now, to be superior to us mere mortal “lay people “ you need to improve your grammar & spellings, otherwise you won’t achieve your desired effect. I can't come across perfect I have to leave room for the mortals LOL
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Post by givusaclue on Mar 8, 2019 22:21:43 GMT 1
I don’t think my willy is big enough to wave in this debate, i’m off to kill some brain cells
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remmington
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Post by remmington on Mar 8, 2019 22:34:51 GMT 1
I don’t think my willy is big enough to wave in this debate, i’m off to kill some brain cells I too am going to politely withdraw from this... Seems to me - someone just wants to make a point! (Just for the sake of it)
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Post by Noberator on Mar 8, 2019 23:11:12 GMT 1
Speedos are mens swim wear. Budgie smugglers. Speedometers measure travelling speed do they not. Is someone playing with words?
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Post by Deleted on Mar 9, 2019 0:11:55 GMT 1
OK let me try to explain. When you drive in your vehicle along a straight road you are moving a given distance in a time period, this I think we can all accept.
So while driving along a street road with a maximum displayed speed of 30 MPH, the key to understanding this is in the MPH and not the number 30. Let me explain;
MPH means miles per hour, miles is a given distance and an hour is a fixed interval of time, i.e. 60 minutes or 3600 seconds. When you drive along a road and the police say you were speeding, can you argue the point that you have been driving 5 minutes and 40 miles per hour in a 30 miles per hour zone and in that same time period you slowed down to 15 miles per hour for 2 minutes, therefore officer I was not speeding because...
When you drive your vehicle no matter what vehicle you drive and you look at the speedo to assess what you believe is your vehicle speed, you are actually looking at 'Miles completed in a given Time period' shown as a NUMBER like 10, 15, 20, 25, 30 etc. This number represents miles in a given time and not vehicle speed.
Can you see what I am saying now!
Try this for further clarification about vehicle speed.
Speed vs. Velocity
Speed is a scalar quantity, it does not account for direction, while velocity is a vector quantity which is aware of direction. If ran across the room and then returned to your original position, you would have a speed - the distance divided by the time. But your velocity would be zero since your position didn't change between the beginning and the end of the interval.
There was no displacement seen at the end of the time period. You would have an instantaneous velocity if it were taken at a point where you had moved from your original position. If you go two steps forward and one step back, your speed isn't affected, but your velocity would be.
So to clarify the justification of a speeding fine
When you drive along the streets at 45 MPH but the street is a maximum of 30 MPH you are speeding, but how is that proven unless you drive for 1 hour at anything over 30 MPH, i.e. 45 MPH!
This is proven by having marked white lines across the road equally spaced at 5 MPH to each other. The key point as explained above the the vector, this includes the direction, without it speed is not defined, so when the camera flashes the position of your vehicle in relation to the white lines determines your distance/time measurement in a given direction (Known from the camera) to prove that you are speeding. Technically the 24 hour clock should be used as the planet turns, but that's a discussion for another day.
Can you now see what I am trying to say?
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Post by valhalla on Mar 9, 2019 0:19:19 GMT 1
That thing in the instrument display that you look at to assess how fast you are going. valhalla should know different As it happens, I don't know any different!! In all my Engineering history, I have never called the instrument that measures speed of the vehicle by anything else other than a speedometer.
I think that is why the speed measuring device is called a Speedometer in the Testers' Manual under Section 7 (Other Equipment) paragraph 8, and continues to be misappropriated as a "Speedometer" throughout the text. Maybe the DVSA team who put this together were not familiar with the other terms for a speed measurement instrument?
Pitot-tube pressure?
Ticker-tape timer?
I'm intrigued, really.....
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Post by Deleted on Mar 9, 2019 0:29:45 GMT 1
I probably was assuming that because you had done the old school degree valhalla that you would have covered it in physics, my apologies for assuming that. I am at an advantage to most in that I have also covered 'Road Traffic Collisions and Investigations' over a three year period many years ago and I am a member of IAEA, the insurance assessors. While I was studying the assessors course we did applied physics in road traffic investigations in some detail, hence why I have sometimes an outlook on subjects completely different to others. I'm not out to stick my head out above the rest just sharing knowledge freely, but sorry if it offends anyone.
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Post by valhalla on Mar 9, 2019 0:35:01 GMT 1
Speed vs. Velocity
Speed is a scalar quantity, it does not account for direction, while velocity is a vector quantity which is aware of direction. If ran across the room and then returned to your original position, you would have a speed - the distance divided by the time. But your velocity would be zero since your position didn't change between the beginning and the end of the interval. Can you now see what I am trying to say? I can see what you are trying to say here, but you are on the wrong side of the argument altogether!
The speedometer is called a speedometer just because it doesn't have a vector either. If you consider how that speed is measured, there is no angular measurement relative to anything that determines what that vector should be, only a scalar amplitude. Velocity is fine if it is measured by GPS or magnetic bearing, but your device on the dashboard only gives a rotational speed of the wheel/s (possibly averaged) multiplied by a driveline ratio to derive a scalar value, not a vector.
That is why you can be charged with speeding in an urban area irrespective of which direction you are instantaneously driving at the time, otherwise you would always have the get-out-clause of "I was driving at right-angles to the traffic sign, so I was only doing 0mph".
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Post by Deleted on Mar 9, 2019 0:41:46 GMT 1
Speed vs. Velocity
Speed is a scalar quantity, it does not account for direction, while velocity is a vector quantity which is aware of direction. If ran across the room and then returned to your original position, you would have a speed - the distance divided by the time. But your velocity would be zero since your position didn't change between the beginning and the end of the interval. Can you now see what I am trying to say?
That is why you can be charged with speeding in an urban area irrespective of which direction you are instantaneously driving at the time, otherwise you would always have the get-out-clause of "I was driving at right-angles to the traffic sign, so I was only doing 0mph".
Are you saying that the camera used to show your vehicle is not positioned in a given known direction, therefore the vehicle speed is not known as a vector?
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