Design of Horizontal Curves
Design of Horizontal Curves
Design of Horizontal Curves
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Spiral <strong>Curves</strong><br />
Spiral Transitions provide a gradual change<br />
in curvature from Tangent to Curve.<br />
Improves appearance and driver comfort.<br />
Provides location for Superelevation Run<strong>of</strong>f.<br />
Generally, NDDOT uses spirals on all curves<br />
greater than 1° on rural highways.<br />
Spirals should be a minimum length <strong>of</strong> 100 ft.
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