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TTE4804 HW_5_Spring11

# TTE4804 HW_5_Spring11 - Course Homework No Due Date TTE...

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Page 1 of 2 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 two-lane 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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TTE4804 HW_5_Spring11 - Course Homework No Due Date TTE...

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