Which I actually get fined for doing 'nearly 40' in a 30
Discussion
Hi folks,
I went past two members of Her Majesty's Constabulary today, one in a car one with a speed gun trained on me. The zone was 30 (which I think is ridiculous as it really is not a built up area, no schools or kids about) but yes it is a 30 zone and I'd crept up to about 40. I braked down to I'd guess just below 40 before going by in the couple of seconds I had after noticing.
http://click2how.com/your-speedometer-wrong-can-dr... According to this site, if my speedometer showed 40 I was probably actually doing about 36-37 and they build in a margin of error to their speed gun calculation as well - am I actually likely to get a 3 point shafting on this?
I went past two members of Her Majesty's Constabulary today, one in a car one with a speed gun trained on me. The zone was 30 (which I think is ridiculous as it really is not a built up area, no schools or kids about) but yes it is a 30 zone and I'd crept up to about 40. I braked down to I'd guess just below 40 before going by in the couple of seconds I had after noticing.
http://click2how.com/your-speedometer-wrong-can-dr... According to this site, if my speedometer showed 40 I was probably actually doing about 36-37 and they build in a margin of error to their speed gun calculation as well - am I actually likely to get a 3 point shafting on this?
HumanDoing said:
http://click2how.com/your-speedometer-wrong-can-dr... According to this site, if my speedometer showed 40 I was probably actually doing about 36-37 and they build in a margin of error to their speed gun calculation as well - am I actually likely to get a 3 point shafting on this?
Do you live in Norway?HumanDoing said:
The zone was 30 (which I think is ridiculous as it really is not a built up area, no schools or kids about) but yes it is a 30 zone and I'd crept up to about 40.
Why did you "creep" up to 40 when it was a "ridiculous" 30 limit? You should have been bold and proud and shown your contempt by racing through at 60!
HumanDoing said:
Hi folks,
I went past two members of Her Majesty's Constabulary today, one in a car one with a speed gun trained on me. The zone was 30 (which I think is ridiculous as it really is not a built up area, no schools or kids about) but yes it is a 30 zone and I'd crept up to about 40. I braked down to I'd guess just below 40 before going by in the couple of seconds I had after noticing.
http://click2how.com/your-speedometer-wrong-can-dr... According to this site, if my speedometer showed 40 I was probably actually doing about 36-37 and they build in a margin of error to their speed gun calculation as well - am I actually likely to get a 3 point shafting on this?
I was cycling one evening when I came upon a BiB doing such speed checking; using a hand-held laser in a 30mph limit. Eager to see how my higher-rate income tax, council tax, NI contributions, VAT and Fuel Duty were being spent, I engaged the officer in polite conversation. They are human after all.I went past two members of Her Majesty's Constabulary today, one in a car one with a speed gun trained on me. The zone was 30 (which I think is ridiculous as it really is not a built up area, no schools or kids about) but yes it is a 30 zone and I'd crept up to about 40. I braked down to I'd guess just below 40 before going by in the couple of seconds I had after noticing.
http://click2how.com/your-speedometer-wrong-can-dr... According to this site, if my speedometer showed 40 I was probably actually doing about 36-37 and they build in a margin of error to their speed gun calculation as well - am I actually likely to get a 3 point shafting on this?
he let have a couple of goes with laser; put the reticle on the numebr palte of the target vehicle, pull the trigger and the vehicle speed is displayed. A large chunk of the taffic was travelling at 35mph. I asked what speed he would pull at; He said 40+ on this piece of road. He would indicate the vehicle to pull in for a chat and if it didn't he'd take note of the number plate and NiP would follow.
It's all very straight forward. The zone is set to 30mph - if you feel this is stupid or uneeded is irrelevent.
31mph is a speeding offence. A cars speedo can over-read by up to 10% however will NEVER under-read. So an indicated 40mph will have you at around 36-37mph.
The "guidelines" for speeding are +10%, +2mph (note, guidelines).
So for a 30mph zone prosecution will usually start at 35mph. There are a select few who will make the claim they were fined at less than 35mph - but as far as I know none of these people have ever been able to prove it (posting copies of the request for driver information etc.)
So, with an indicated 40mph in a 30mph zone - yes, you could be prosecuted. 3pts + £100.
31mph is a speeding offence. A cars speedo can over-read by up to 10% however will NEVER under-read. So an indicated 40mph will have you at around 36-37mph.
The "guidelines" for speeding are +10%, +2mph (note, guidelines).
So for a 30mph zone prosecution will usually start at 35mph. There are a select few who will make the claim they were fined at less than 35mph - but as far as I know none of these people have ever been able to prove it (posting copies of the request for driver information etc.)
So, with an indicated 40mph in a 30mph zone - yes, you could be prosecuted. 3pts + £100.
Stoofa said:
It's all very straight forward. The zone is set to 30mph - if you feel this is stupid or uneeded is irrelevent.
31mph is a speeding offence. A cars speedo can over-read by up to 10% however will NEVER under-read. So an indicated 40mph will have you at around 36-37mph.
I agree with all of your post.31mph is a speeding offence. A cars speedo can over-read by up to 10% however will NEVER under-read. So an indicated 40mph will have you at around 36-37mph.
On the web site above I was interested that one test car DID unread at 50kmph - a Volvo of all things. But definitely the odd one out and no defence.
Stoofa said:
A cars speedo can over-read by up to 10% however will NEVER under-read.
As said by a man who has obviously never owned a TVR which will display random speeds somewhere vaguely close to what you may or may not be travelling at. But it's a easy fix just pop the glass off the gauge and tweak the needle slightly so it's a bit closer 
It is, in my experience, a myth that speedos overstate speed by about 10%.
I have checked on every car that I have driven recently (using the satnav), and all have been pretty accurate.
For example, 70mph on the speedo in my car is about 67/68mph. In a Mazda that I drove recently, the speed was about 2% out (if that).
I have checked on every car that I have driven recently (using the satnav), and all have been pretty accurate.
For example, 70mph on the speedo in my car is about 67/68mph. In a Mazda that I drove recently, the speed was about 2% out (if that).
ORD said:
It is, in my experience, a myth that speedos overstate speed by about 10%.
I have checked on every car that I have driven recently (using the satnav), and all have been pretty accurate.
For example, 70mph on the speedo in my car is about 67/68mph. In a Mazda that I drove recently, the speed was about 2% out (if that).
Agreed. Every car I have had in recent years seems to over read by 3 or 4 mph at any speed between 30 and 70 or so. Compared to GPS. I have checked on every car that I have driven recently (using the satnav), and all have been pretty accurate.
For example, 70mph on the speedo in my car is about 67/68mph. In a Mazda that I drove recently, the speed was about 2% out (if that).
Speedo's can't under read. I used to think that was why there was a typical 10% grace on speed limits as speedos were +/- 10% but thats not the case as speedos are accurate to +10%. From a design point of view you've target 1-2mph over as speed will change slightly based on tyre wear and vagaries in manufacturing.
If you've been clocked - unless in scotland, 40 in a 30 you're likely to be offered a SAC if eligible - the guidelnes for a 30 are 35-42mph.
If you've been clocked - unless in scotland, 40 in a 30 you're likely to be offered a SAC if eligible - the guidelnes for a 30 are 35-42mph.
Vaud said:
Jon1967x said:
Speedo's can't under read.
http://click2how.com/your-speedometer-wrong-can-drive-faster/The Volvo in their test did...
Vehicle construction and use regulations require a vehicle speedometer accuracy to be in the range of -0->+10%. If that table is correct then the Audi is non compliant
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