Quote:
Originally Posted by Viatron
Oh yes I forgot, come on then Towed tell me how many regs I would be breaking if "theoretically" I was to be silly enough to fit a GPS speedo please?
|
None that I know of.
http://www.legislation.gov.uk/uksi/1...lation/35/made
No mention of it needing to be mechanical or electronic, it just has to work, and must indicate both mph and kph if the donor was registered after 1st April 1984.
It mustn't indicate more than 10% (+4kph) more than the actual speed of the vehicle and must
never indicate less than the actual speed.
None of the above is checked on the MOT either, the
speedo just has to be present and intact.
I've regularly conducted speed calibration checks on job cars over the last few years - If I've followed and prosecuted someone for speeding, if it's practicable, as soon as possible afterwards I do multiple passes down a quiet stretch of dual carriageway holding the speed at 10mph increments above and below the speed I believe they were doing, while a colleague checks my true speed with a calibrated gun.
So, if it is my opinion that they were going 70 in a 50 limit, I drive at an indicated 50, 60, 70, 80 and 90mph, while a colleague checks my actual speed. We then write statements that show the margin of error between the indicated and actual speeds which gives me an evidential argument as to how fast the motorist was really going (we have other methods too, btw).
The cars have a traditional
speedo and a speed reading on the (Garmin) sat nav, and the sat nav has been spot on every time, while the built in
speedo is often reading 10mph high at 100mph, showing 110mph on the clock and 100 on the gun. Don't take it as gospel, but I'd trust a gps
speedo over a mechanical one any day.
The only drawback I can see with a GPS
speedo is that it won't work when you go through tunnels. I'd suggest you get to know what speed you're doing at what revs and monitor your speed that way when it's not working.
Oh, and in eight years as a plod I've had a lot of people contest their speeding tickets
but I've never lost a case.
Nice dials by the way, a tad expensive but very nice.