P38A Original wheel size please?

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wammers said:
Vehicles made prior to 2001 are allowed plus or minus 10% at an indicated 30MPH. The 10% is pro rata to all other limits. Speed cameras are set at 30 MPH plus 10% plus 2 MPH. So with a pre 2001 car in a 30 zone you can be doing 35 MPH at an indicated 30 quite legally. But as a famous person said "Not a lot of people know that" so the coppers get away with it. In particular jobs worths with speed guns. How can they enforce the law when they don't know what it is.
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Can't remember with certainly if I was driving my 2000 P38 or the 2002 A8, but more likely to have been in the P38.
 
I got one point on my licence over here for being 2kph over the 70kph limit at midnight on a straight empty road. As near as I could tell from the mph speedo I was doing 70:mad: No allowance made at all for speedo error.
 
Datatek said:
I got one point on my licence over here for being 2kph over the 70kph limit at midnight on a straight empty road. As near as I could tell from the mph speedo I was doing 70:mad: No allowance made at all for speedo error.
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Commiserations Keith! At the speed awareness course, one guy got really uppity when told that HE was responsible for his faulty speedo. He started "effing and jeffing", so was ejected off the course! The guy taking the course then said that, in addition to points and an increased fine for speeding, he'd also be charged for failing to complete the course too!
 
Datatek said:
I got one point on my licence over here for being 2kph over the 70kph limit at midnight on a straight empty road. As near as I could tell from the mph speedo I was doing 70:mad: No allowance made at all for speedo error.
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Thats the Frogs for you. :D
 
Jon Dor said:
Commiserations Keith! At the speed awareness course, one guy got really uppity when told that HE was responsible for his faulty speedo. He started "effing and jeffing", so was ejected off the course! The guy taking the course then said that, in addition to points and an increased fine for speeding, he'd also be charged for failing to complete the course too!
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There is no service requirement to check a speedo accuracy. Never has been on any vehicle service i have ever carried out on many different makes of vehicle.
 
kermit_rr said:
How would one test if a speedo was accurate?
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I guess by driving a known distance and establishing accurately how long it takes. I used to time how long my Dad would take to drive over a measured mile using the regular, 1/10th mile markers on Motorways. I'd then tell him what speed we were doing. I'm talking about back in the mid-1960's in his company cars..Ford Mark1 Cortina, Ford Corsair and latterley in a Vauxhall VX 4/90. Interestingly, the displayed MPH used to pretty much match my calculations.
 
You're all right of course, but i was thinking from the legal perspective, i can't see it would stand up in court, most of us aren't experts or professionals and the equipment to hand won't be up to standard
 
So has anyone else compared a P38 speedo to satnav ? Mine seems to indicate about 10% high compared to three different satnav's and snooper GPS. All the GPS indicate the same within 1mph at 70.
 
kermit_rr said:
You're all right of course, but i was thinking from the legal perspective, i can't see it would stand up in court, most of us aren't experts or professionals and the equipment to hand won't be up to standard
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In court, quite simply, the driver will be found guilty of the speeding offence. Many years ago, I bought an ex-police Rover SD1. It had a calibrated speedo on it. Of course, if fitted with different wheels and tyres, that would undoubtedly be incorrect too.
 
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