PRIN.OF HIGHWAY ENGINEERING&TRAFFIC ANA.
7th Edition
ISBN: 9781119610526
Author: Mannering
Publisher: WILEY
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Chapter 3, Problem 10P
To determine
The difference in design curve length for the 2012 and 2025 designs.
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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.
An existing horizontal curve has a radius of 85 meters, which restricts the
maximum speed on this section of road to only 60% of the design speed of the
highway. Highway officials want to improve the road to eliminate this bottleneck.
Assume coefficient of side friction is 0.15 and rate of superelevation is 0.08.
Compute the existing speed, design speed, and find the new radius of curvature.
Chapter 3 Solutions
PRIN.OF HIGHWAY ENGINEERING&TRAFFIC ANA.
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