On Wednesday 25 January 2006 04:44, John Hynes wrote: > In the US, speeds are usually regulated in increments of 5 mph. (I have > seen one or two exceptions.) 1 m/s is about 2.237 mph, so here are some > rounded conversions: > > MPH m/s km/h > 5 2 8 > 10 4 16 > 15 7 24 > 20 9 32 > 25 11 40 > 30 13 48 > 35 16 56 > 40 18 64 > 45 20 72 > 50 22 80 > 55 25 89 > 60 27 97 > 65 29 105 > 70 31 113 > 75 34 121 > > It is not hard to imagine that if road speeds were to be expressed in m/s, > that a smaller number of 5 m/s increments would be used. > > m/s MPH km/h > 5 11 18 > 10 22 36 > 15 34 54 > 20 45 72 > 25 56 90 > 30 67 108 > 35 78 126
To keep about the same increment as the 5 mph, it might be a good idea to use an increment of 9 km/h, thus making speeds that can be converted exactly to m/s (the unit to use when thinking about a car accident) without any trailing repeating decimals. phma
