Page "Degree of curvature" Paragraph 1
from
Wikipedia
A n-degree curve turns the forward direction by n degrees over some agreed-upon distance.
The usual distance in US road work is 100 ft ( 30. 48 m ) of arc.
US railroad work traditionally used 100 ft of chord and this may be used in other places for road work.
Other lengths may be used — such as 100 metres where SI is favoured, or a shorter length for sharper curves.
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1.892 seconds.