Police Dog found dead!

[KeithD]

Well again that's a case of seeing from the outside rather than the other side.

I see it from both sides, I know a number of those in our emergency services. I even know a prison officer who punched the Governer in the face and kept his job because they are short staffed!

[johncar54]

I see it from both sides, I know a number of those in our emergency services. I even know a prison officer who punched the Governer in the face and kept his job because they are short staffed!

sorry Kieth I thought we were having a good matured exchange of views.

Quote UK speedo's by law have to be set with an error rate of 5% +/- 10kph

OK I agree in principle but would prefer the wording to more like speed MUST be accurate to within 10%


If you would like to be more precise. Wikipedia:----

Most speedometers have tolerances of some 10% plus or minus due to wear on tires as it occurs. Additional sources of error are tire diameter variations due to temperature, pressure, vehicle load, and nominal tire size.

Modern speedometers are said to be accurate within 10% but as this is legislated accuracy, this may not be entirely correct. This can make it difficult to accurately stay on the speed limits imposed; most countries allow for this known variance when using RADAR to measure speed, although levels of some 3 km/h or 3% are also used in areas of tough enforcement. This causes many arguments due to motorists complaining that they were not doing the speed as reported. Revenue[3] is being increasingly blamed for these stricter measures. There are strict United Nations standards in place but it seems not being enforced leaving this matter in limbo for many countries. Excessive speedometer error after manufacture can come from several causes but most commonly is due to nonstandard tire diameter, in which case the

percent error = 100x("standard diameter"/"new diameter" - 1).

Nearly all tires now have their size shown as "T/A_W" on the side of the tire (See: Tire code), and the tire's

diameter in inches = TxA/1270 + W.

For example, a standard tire is "185/70R14" with diameter = 185x70/1270 + 14 = 24.20 in. Another is "195/50R15" with 195x50/1270 + 15 = 22.68 in. Replacing the first tire (and wheels) with the second (on 15" wheels), a speedometer reads 24.19/22.68 = 1.0670 times the correct speed or 6.7% too high.

[KeithD]

sorry Kieth I thought we were having a good matured exchange of views.

We are....what I said was FACT.

I know how the physics of a speedo work, Wiki is generic, and not always accurate, especially to specific country laws.

Police RADAR is calabrated to that of what GPS shows, as I believe an atomic clock is quite accurate (unless you're a creationist ). My Speedo says 75mph....I pass a speed check sign (same technology as RADAR)....it says 70mph...my GPS says 70mph....so I know what is accurate for my vehicle. Each car is different though, so folk need to check individually.

[Mrs Daddy]

I see it from both sides, I know a number of those in our emergency services. I even know a prison officer who punched the Governer in the face and kept his job because they are short staffed!