Question

Highway Curves If a circular curve without any
banking has a radius of R feet, the speed limit L
in miles per hour for the curve is L= 1.5"R.
(Source: N. Garber.)
(a) Find the speed limit for a curve having a radius
of 400 feet.
(b) If the radius of a curve doubles, what happens to
the speed limit?
(c) A curve with a 40-mile-per-hour speed limit is
being designed. What should be its radius?

Answer 1

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Answer 2

(a) 1.5*400=600.
(b)if radius doubles then speed limit also doubles
(c) 40=1.5*R
R=40/1.5=26.26