What is the minimum spiral curve length transition for a new roadway with a radius of 1000 feet and a design speed of 45 miles per hour (mph), assuming a 2 ft/sec3 lateral acceleration increase rate?

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The minimum spiral curve length transition for a new roadway with a radius of 1000 feet and a design speed of 45 mph is 143.5 feet. Solution: Use American Association of State Highway Transportation Officials (AASHTO)Equation for minimum length of spiral transition curve LS1U1B1sS1U1B0 = 3.15 x (design speed)S1U1P13

What Is the Minimum Spiral Curve Length Transition for a New