Principles of Highway Engineering and Traffic Analysi (NEW!!)
6th Edition
ISBN: 9781119305026
Author: Fred L. Mannering, Scott S. Washburn
Publisher: WILEY
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Chapter 3, Problem 10P
To determine
The difference in the design curve length for the
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A vertical curve was designed in 2005 for SSD requirements at a design speed of 120 km/h to
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A vertical curve was designed in 2006 for SSD requirements at a design speed of 120 km/h to connect grades G1 = +1% and G2 = -2%. The curve is to be redesigned for 120 km/h design speed in the year 2050. Vehicle braking technology has advanced such that vehicle deceleration rate has increased by 40% relative to 3.4m/s2 value used in the original design. However, due to the higher percentage of older people in the driving population, design reaction times have increased by 20%. Also, because vehicles have become smaller, the driver’s eye height is assumed to be 0.9 m above pavement.
Compute the difference in design curve lengths for the 2006 and 2050 designs. Assume heye =1.08 and hobs = 0.60 m.
A new transportation engineer is charged with the design of a horizontal curve a certain
highway. His final design calls for a curve with a radius of 520 meters. Assume that the design
speed for the highway is 110 km/h. Is the design curve acceptable? Consider super elevation
of 8% and a maximum side friction factor of 0.1.
Chapter 3 Solutions
Principles of Highway Engineering and Traffic Analysi (NEW!!)
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