77MPH Speeding ticket M74
Discussion
If you can spot the white marker posts at the side of the motorway, with the blue band and red square.
count the first as 0 and last as 16 that is one mile.
set your cruise control at an indicated 60, don't change lane and see what your time is and make adjustments
To check tyre variation use one of the many calculators on line and work out the speedo variation. ALL speedos by law NOW I think from 1994 (?) must only over read not under by a max of 10%
Also tyre wear makes a difference depending on the way the speedo is working. If minimum tread is say 2mm and max 7.5mm then a 10mm variation from max to minimum in rotation, plus there is inflation and temp, so usually if off a wheel is about +/- 2% variation. you can calculate this all manually but really need tyre manuf figures for tyres to get it spot on
Usually sat nave work well problem being you re dependant on the same sats if using different devices in car at same time
There are marked police 1/2 mile measured areas. In Hamilton on the racecourse road being the yellow posts.
count the first as 0 and last as 16 that is one mile.
set your cruise control at an indicated 60, don't change lane and see what your time is and make adjustments
To check tyre variation use one of the many calculators on line and work out the speedo variation. ALL speedos by law NOW I think from 1994 (?) must only over read not under by a max of 10%
Also tyre wear makes a difference depending on the way the speedo is working. If minimum tread is say 2mm and max 7.5mm then a 10mm variation from max to minimum in rotation, plus there is inflation and temp, so usually if off a wheel is about +/- 2% variation. you can calculate this all manually but really need tyre manuf figures for tyres to get it spot on
Usually sat nave work well problem being you re dependant on the same sats if using different devices in car at same time
There are marked police 1/2 mile measured areas. In Hamilton on the racecourse road being the yellow posts.
S2red said:
No Your speedometer could both underread or overread by 10% so you could be sitting with 70mph on Speedo and be doing anything between 63 & 77mph
Rubbish. You show me a standard car with standard wheels that under reads I will eat my left nut.I've never seen a car over reading by more than 5mph.
Ibiza125 said:
S2red said:
No Your speedometer could both underread or overread by 10% so you could be sitting with 70mph on Speedo and be doing anything between 63 & 77mph
Rubbish. You show me a standard car with standard wheels that under reads I will eat my left nut.I've never seen a car over reading by more than 5mph.
Gassing Station | Scotland | Top of Page | What's New | My Stuff