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Civil Engineering PE

Category - Transportation

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The change in vertical curve direction effects passenger comfort more on sag curves than crest vertical curves because of which of the following reasons?

Gravitational and centripetal forces are equal
Gravitational and centripetal forces are in opposite directions
Gravitational and centripetal forces are greater than frictional forces
None of the above

Explanation

Answer: B - The change in vertical curve direction effects passenger comfort more on sag curves than crest vertical curves because the gravitational and centripetal forces are in opposite directions. In addition to passenger comfort, three other criteria are considered when establishing the minimum lengths of vertical curves:

• Headlight sight distance
• Drainage
• General appearance

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