In my work I have to deal with EU law on a regular basis and the area I deal with is one of the most complex and outdated. Hence I've always had an interest in this kind of thing and calibrate my speedo on a regular basis using motorway distance markings which are every 100m on Irish motorways. I usually calibrate over 20 km or more.
Note the European regulation requires the speedometer to underestimate the actual speed at all times.
At all times a vehicles speedometer must indicate a higher speed than that actually travelled.
From experience the speedometer on the Insignia can be up to 10km/hr (above) out depending on tyre wear, at 120kph. See the link below.
This is the requirement for the speedometer and does not take account of the accuracy of external measurement equipment used by the enforcement authorities, (laser/radar etc) At the very minimum one can travel at the speed (V2):0<V1-V2<V2/10+4kph where '<' is equal to or less than and V1 is indicated speed and V2 is actual speed without fear of prosecution.
Note the requirement regarding tyre pressures etc......get out of jail clause!
In Ireland the vast majority of speeding fines are issued to vehicles travelling over 10kph over the prescribed limit. Offficial stats prove this.
http://eur-lex.europ...75L0443&from=EN
Just for info, I have never got a speeding fine.
Note the European regulation requires the speedometer to underestimate the actual speed at all times.
At all times a vehicles speedometer must indicate a higher speed than that actually travelled.
From experience the speedometer on the Insignia can be up to 10km/hr (above) out depending on tyre wear, at 120kph. See the link below.
This is the requirement for the speedometer and does not take account of the accuracy of external measurement equipment used by the enforcement authorities, (laser/radar etc) At the very minimum one can travel at the speed (V2):0<V1-V2<V2/10+4kph where '<' is equal to or less than and V1 is indicated speed and V2 is actual speed without fear of prosecution.
Note the requirement regarding tyre pressures etc......get out of jail clause!
In Ireland the vast majority of speeding fines are issued to vehicles travelling over 10kph over the prescribed limit. Offficial stats prove this.
http://eur-lex.europ...75L0443&from=EN
Just for info, I have never got a speeding fine.
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