18.2.2.2.2 - Case 2 Length of valley curve less than stopping sight distance (L<S)
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Practice Questions
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What does L represent in the context of valley curves?
💡 Hint: Think about what distance is crucial in road design.
What is Stopping Sight Distance (SSD)?
💡 Hint: Consider how far a vehicle can travel after a driver reacts.
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Interactive Quizzes
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What is the formula for calculating the length L of a valley curve when L is less than SSD?
💡 Hint: Think about how we derive L from S and N.
True or False: The length of a valley curve can be less than the stopping sight distance without safety implications.
💡 Hint: Consider the effects on driver reactions.
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Challenge Problems
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Your road design includes a valley curve with an estimated sight distance of 80m and a deviation angle of 4m. Calculate L and analyze its implications on road safety.
💡 Hint: Be mindful of the total curve extent.
A rural road design shows a valley curve length of 100m while SSD required is 90m. Discuss potential safety issues with this design.
💡 Hint: Consider factors like speed limits and gradient changes.
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