[openstreetmap/openstreetmap-website] Added km & miles distance selection (#1747)

[Colin Smale]

On 2018-02-13 19:12, Bryan Housel wrote:

> A common way to handle this in Imperial units is to display the distance in miles down to about 0.2 mile (rounded to nearest tenth, e.g. "1.3 miles"), then display in feet below that.. Definitely avoid using yards for this.

..unless you are in the UK. In that case avoid using feet - nobody uses
feet for linear distances on the road but they are used for e.g.
height/width restrictions. 

IMHO the scientific accuracy is secondary to the recognisability/clarity
of the instruction in this case. Rounding / approximating to "half a
mile", or "quarter of a mile" would be excellent. Below that its yards -
200y, 100y, 50y, 20y, 10y.
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