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4 cards from this section. Quick, good the night before a test.
What is a valley curve?
Think about how roads change elevation.
Name one type of gradient that can form a valley curve.
Consider which ways the road can slope.
What is a valley curve?
Think about the term 'sag' associated with valley curves.
True or False: Valley curves are not necessary for road design.
Consider the purpose of transitions in road design.
Given a valley curve formed by a descending gradient of n=1 in 25 and an ascending gradient of n=1 in 30, calculate both stopping sight distance and the length of the valley curve. Assume a safe design speed of 80 km/h.
Apply comfort and safety criteria formulas to find both conditions.
Discuss the ramifications of not accounting for headlight sight distance when designing valley curves, and provide examples of potential issues.
Think about situations where low visibility can cause danger.
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