When designing a highway, safety is the primary concern. When the horizontal and vertical alignments are combined, the d

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When designing a highway, safety is the primary concern. When
the horizontal and vertical alignments are combined, the design can
be challenging. Recently, on the curve of a two-lane rural highway
with two 12-ft lanes as illustrated in the figure below, a fatal
crash in which the driver traveled eastbound and hit a roadway
object occurred at night. The lawsuit alleged that the 50-mph
posted speed limit is unsafe for this curve and a major cause of
the crash. As a designer, please evaluate this design and provide
your explanations. When designing a highway, safety is the
primary concern. When the horizontal and vertical alignments are
combined, the design can be challenging. Recently, on the curve of
a two-lane rural highway with two 12-ft lanes as illustrated in the
figure below, a fatal crash in which the driver traveled eastbound
and hit a roadway object occurred at night. The lawsuit alleged
that the 50-mph posted speed limit is unsafe for this curve and a
major cause of the crash. As a designer, please evaluate this
design and provide your explanations.