An equal tangent vertical curve was designed in 2012 for a design speed of 70 mi
ID: 1826584 • Letter: A
Question
An equal tangent vertical curve was designed in 2012 for a design speed of 70 mi/hr to connect grades G1=+1.2% and G2=-2.1%. The curve is to be redesigned for a 70 mi/hr design speed in 2025. Vehicle braking technology has advanced so that the recommended deceleration rate is 25% greater than the 2011 value, but due to higher percentage of older persons in the driving population, design reaction times have increased 20%. Also vehicles have become smaller so that the driver's eye height is assumed to be 1.0 ft above the pavement surface. compute difference in design curve lengths for the 2012 and 2025 designs.Explanation / Answer
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