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From: Silvano <Silvano@noncisonopernessuno.it>
Newsgroups: sci.lang, alt.usage.english
Subject: Re: OT: Converting miles/km
Date: Fri, 20 Sep 2024 15:51:47 +0200
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Phil hat am 20.09.2024 um 12:40 geschrieben:
> On 20/09/2024 11:10, Bertel Lund Hansen wrote:
>> Helmut Richter wrote:
>>
>>> And easier to remember than 1.609344. But when will you need such
>>> precision?
>>> For instance, when you drive on German roads outside villages, you must
>>> reduce your speed to 31.0685 mph whereas the rough rule 1 mi = 1.6 km
>>> would
>>> have allowed you 31.2500 mph.
>>
>> I haven't neede it, but just for fun I have calculated the Danish speed
>> limits in miles. If you want round firgures, it's:
>>
>>          50 km = 30 mi
>>          80 km = 50 mi
>>        110 km = 70 mi (2 km too much)
>>        130 km = 80 mi
>>
> 
> I'm not sure how common this is, but the speedometer in my car has
> scales for both mph and km/h, so in principle I don't need to convert.
> In practice, though, I have the above table in my head, from the old
> days. It's easily remembered because the right-hand column corresponds
> to the usual preferred values for UK speed limits.


And the left column corresponds to the usual preferred values for speed
limits in Continental Europe, AFAIK.
You should add 30 km (reduced speed in some parts of cities) and 120 km
(seen from time to time).