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Course:
TTE 4804/5805—Highway Geometric Design
Homework No.:
Five
Due Date:
Thursday, March 3, 2011
1.
A vertical curve on a 70 mph roadway is to connect two grades of +2.4% and 3.3%.
(a)
Determine the minimum length of a vertical curve needed to satisfy SSD.
(b)
Determine the minimum length of a vertical curve needed to satisfy PSD.
(c)
Determine the minimum length of a vertical curve needed to satisfy decision sight
distance.
In all cases use the formulas in the AASHTO Green book.
2.
A section of a twolane highway consists of a 6% grade intersecting a 0% grade.
The
speed limit on the highway is 45 mph.
The height of headlights of an average car is 2 ft.
with a beam angle of 1 degree.
(a)
What is the minimum length of sag vertical curve required to join the two grades
considering stopping, comfort, and appearance criteria?
(b)
What is the minimum length of sag vertical curve required to join the two grades
considering safe passing criterion?
(c)
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 Spring '11
 Moses
 Road, Freeway, vertical curve, sag vertical curve

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