18.2.2.2 - Safety criteria
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Practice Questions
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What does the abbreviation SSD represent in road design?
💡 Hint: Think about what distance drivers need to stop.
True or False: Valley curves are always straight.
💡 Hint: Recall the shape formed by gradients.
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Interactive Quizzes
Quick quizzes to reinforce your learning
What is the primary concern of safety criteria for valley curves?
💡 Hint: Think about what makes a road safe.
True or False: Valley curves only need to be considered during the day.
💡 Hint: When do headlights come into play?
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Challenge Problems
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A valley curve is proposed for a new road section. The expected stopping sight distance is 150m. Calculate the necessary conditions if the valley curve is to be designed shorter than SSD. Discuss the implications on safety.
💡 Hint: Consider how the light reaches different parts of the curve.
Given a scenario where a road needs to accommodate higher traffic speeds, what adjustments would you make to both the valley curve length and the safety criteria?
💡 Hint: How does speed relate to stopping distance?
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