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Determine the minimum length of a sag vertical curve between -0.9% grade and a +0.6% grade...

Determine the minimum length of a sag vertical curve between -0.9% grade and a +0.6% grade for a road with a 130km/hr design speed. The curve must provide 250m stopping SD and meet the California Appearance Criteria and the AASHTO Comfort Standard. Please show all steps, Thank you

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