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Q) A crest curve has grades of +gi and -g2. A sag curve has grades of -gi and +g2. Both curves have the same design speed V. Assuming Gavg AASHTO’s typical values for parameters: = 0 and, SSD < L for both curves, and using a) For which one of those two curves, is the Stopping Sight Distance (SSD) larger and why? b) Bonus: For which one of those two curves, is the length L larger and why?

Q) A crest curve has grades of +gi and -g2. A sag curve has grades of -gi and +g2. Both curves have the same design speed V. Assuming Gavg AASHTO’s typical values for parameters: = 0 and, SSD < L for both curves, and using a) For which one of those two curves, is the Stopping Sight Distance (SSD) larger and why? b) Bonus: For which one of those two curves, is the length L larger and why?

Traffic and Highway Engineering
Traffic and Highway Engineering
5th Edition
ISBN:9781305156241
Author:Garber, Nicholas J.
Publisher:Garber, Nicholas J.
Chapter15: Geometric Design Of Highway Facilities
Section: Chapter Questions
Problem 21P
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Q) A crest curve has grades of +gi and -g2. A sag curve has grades of-gı and +g2. Both curves have the same design speed V. Assuming Gavg = 0 and, SSD < L for both curves, and using AASHTO’s typical values for parameters: a) For which one of those two curves, is the Stopping Sight Distance (SSD) larger and why? b) Bonus: For which one of those two curves, is the length L larger and why?
Transcribed Image Text:Q) A crest curve has grades of +gi and -g2. A sag curve has grades of-gı and +g2. Both curves have the same design speed V. Assuming Gavg = 0 and, SSD < L for both curves, and using AASHTO’s typical values for parameters: a) For which one of those two curves, is the Stopping Sight Distance (SSD) larger and why? b) Bonus: For which one of those two curves, is the length L larger and why?
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