Spiral Transition Curves. On NB U.S. Highway 12 just before it reaches CR21 the road turns NE toward I-25. The turn actually consists of two circular horizontal curves, connected by a spiral curve. The radius of the first HC is 689 feet and the radius of the second HC is 529 feet. If the design speed for this part of U.S. 12 is 65 mph, what should be the minimum length of the spiral? Ifthe superelevation rale is 0.06. does the distance between the two curves change?
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