I agree - and there’s a mechanism for detecting a fast puncture which uses the chosen method of reading from the driveshaft to alert the driver
Many of my cars have mechanicals ones however I’m having an electronic one fitted to my (real) mini which translates movement to digital. GPS can be used to supply a reading too - some with a form of intelligence for tunnels > On 7 Sep 2020, at 7:01 pm, Martin Vlietstra <[email protected]> wrote: > > Steve, > > What is the basic principal behind the measurement of speed these days. > According to Wikipedia, the normal method is to measure the rotational speed > of the drive shaft or the wheel electronically and from that to infer the > speed. There are of course other techniques using the Doppler effect when > some form of signal is bounced off the road, but I suspect that the > electronics behind that is more complex than a simple pulse counter. > > From: Stephen Humphreys [mailto:[email protected]] > Sent: 07 September 2020 15:16 > To: Martin Vlietstra > Cc: USMA List Server > Subject: Re: [USMA 1524] Re: sort out our ridiculously muddled measurements > (in the UK) > > They don’t make cas with mechanical mileometers/speedos anymore Martin - that > ship sailed almost decades ago > > Sent from my iPhone > > > On 7 Sep 2020, at 2:35 pm, Michael Payne <[email protected] > <mailto:[email protected]>> wrote: > >> >>> Sweden is safer and they drive on the other side. But I don’t think that >>> has much to with it. Many accidents here in France with people driving on >>> the wrong side of the road. >>> >>> https://nam01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fec.europa.eu%2Ftransport%2Ffacts-fundings%2Fscoreboard%2Fcompare%2Fpeople%2Froad-fatalities_en&data=02%7C01%7Cusma%40lists.colostate.edu%7Ca19f6ea62c6344b4abd808d8537f390b%7Cafb58802ff7a4bb1ab21367ff2ecfc8b%7C0%7C0%7C637351153173054603&sdata=UFWaEaZYks%2BiwgrzTkTBviRDL55rM1SpgF6BZgxR4K8%3D&reserved=0 >>> >>> <https://nam01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fec.europa.eu%2Ftransport%2Ffacts-fundings%2Fscoreboard%2Fcompare%2Fpeople%2Froad-fatalities_en&data=02%7C01%7Cusma%40lists.colostate.edu%7Ca19f6ea62c6344b4abd808d8537f390b%7Cafb58802ff7a4bb1ab21367ff2ecfc8b%7C0%7C0%7C637351153173059594&sdata=G%2FycXoAy1AiYvephJpSCJzKrgj4IQQ9QKkjLLXjUZ30%3D&reserved=0> >>> >> https://nam01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fmedia.rac.co.uk%2Fpressreleases%2Fmore-than-10-percent-of-brits-admit-to-driving-on-wrong-side-of-the-road-in-europe-1509276&data=02%7C01%7Cusma%40lists.colostate.edu%7Ca19f6ea62c6344b4abd808d8537f390b%7Cafb58802ff7a4bb1ab21367ff2ecfc8b%7C0%7C0%7C637351153173059594&sdata=XCDEPq80wsjqwRErLJXTGXPyyZgdub8lbYpIt6GCs44%3D&reserved=0 >> >> <https://nam01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fmedia.rac.co.uk%2Fpressreleases%2Fmore-than-10-percent-of-brits-admit-to-driving-on-wrong-side-of-the-road-in-europe-1509276&data=02%7C01%7Cusma%40lists.colostate.edu%7Ca19f6ea62c6344b4abd808d8537f390b%7Cafb58802ff7a4bb1ab21367ff2ecfc8b%7C0%7C0%7C637351153173059594&sdata=XCDEPq80wsjqwRErLJXTGXPyyZgdub8lbYpIt6GCs44%3D&reserved=0> >> >> >> >> On 6 Sep 2020, at 19:33, Stephen Humphreys <[email protected] >> <mailto:[email protected]>> wrote: >> >> That ship has sailed. >> >> And UK road are STILL the safest in the UK. Lets leave it that way - as the >> government and popular opinion suggests >> >> >> >> On 6 Sep 2020, at 6:26 pm, Michael Payne <[email protected] >> <mailto:[email protected]>> wrote: >> >> https://nam01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fnews.bbc.co.uk%2F2%2Fhi%2F8239048.stm&data=02%7C01%7Cusma%40lists.colostate.edu%7Ca19f6ea62c6344b4abd808d8537f390b%7Cafb58802ff7a4bb1ab21367ff2ecfc8b%7C0%7C0%7C637351153173059594&sdata=H6QpMOk1UQXCnejIfFMU7HqH1JUGSLwtarGxnUm0mtY%3D&reserved=0 >> >> <https://nam01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fnews.bbc.co.uk%2F2%2Fhi%2F8239048.stm&data=02%7C01%7Cusma%40lists.colostate.edu%7Ca19f6ea62c6344b4abd808d8537f390b%7Cafb58802ff7a4bb1ab21367ff2ecfc8b%7C0%7C0%7C637351153173064585&sdata=ARMoL4%2BKQIcYCk3Pmp2VDsn8UjTzjdz8EzmWtPpcmCo%3D&reserved=0> >> >> This particular article is 11 years old, so pre Brexit. >> >> The above website list comments on which side would be best to drive on in >> the UK. But further down are comments, one of which is to sort out the >> “muddled measurements” in the UK. (Below Alex, Birmingham. >> >> With the Brits around here in France, I’ve noticed it’s cheaper to buy a >> comparable used car in the UK, but more expensive to buy new in the UK. I >> figure it must have something to do with the market available for both new >> and used in the UK compared to the rest of Europe. Never mind the accidents >> from Brits starting out in the countryside here on the wrong side. >> >> Mike Payne >> France >> >> >> _______________________________________________ >> USMA mailing list >> [email protected] <mailto:[email protected]> >> https://lists.colostate.edu/cgi-bin/mailman/listinfo/usma >> <https://nam01.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.colostate.edu%2Fcgi-bin%2Fmailman%2Flistinfo%2Fusma&data=02%7C01%7Cusma%40lists.colostate.edu%7Ca19f6ea62c6344b4abd808d8537f390b%7Cafb58802ff7a4bb1ab21367ff2ecfc8b%7C0%7C0%7C637351153173064585&sdata=m%2Fx0RxH4bDm4LxHt0i22dwshlxcIAV9A0iL1lkInW3k%3D&reserved=0> >> >> >> _______________________________________________ >> USMA mailing list >> [email protected] <mailto:[email protected]> >> https://lists.colostate.edu/cgi-bin/mailman/listinfo/usma >> <https://nam01.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.colostate.edu%2Fcgi-bin%2Fmailman%2Flistinfo%2Fusma&data=02%7C01%7Cusma%40lists.colostate.edu%7Ca19f6ea62c6344b4abd808d8537f390b%7Cafb58802ff7a4bb1ab21367ff2ecfc8b%7C0%7C0%7C637351153173064585&sdata=m%2Fx0RxH4bDm4LxHt0i22dwshlxcIAV9A0iL1lkInW3k%3D&reserved=0>
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