Loading the lesson
Loading the lesson
Search AllRounder.ai
Search the courses, subjects, tracks, games and features, or jump straight to a page.
Search the courses, subjects, tracks, games and features, or jump straight to a page.
3 cards from this section. Quick, good the night before a test.
What is a valley curve?
Think about what happens when a road goes downwards.
What shape is preferred for valley curves?
Remember the name has two words; what does it relate to?
What are valley curves primarily used for?
Think about how roads deal with hills and valleys.
True or False: Valley curves are only necessary during the day.
Consider what happens after dark.
A new road is to be constructed through a steep valley. If the descending gradient is n = 1 in 25 and the ascending gradient is n = 1 in 30, calculate the required length of the valley curve for a design speed of 80 km/h. Assume c = 0.6 m/sec³ and SSD = 127.3m.
Break down the problem using comfort and safety criteria as you learned about.
Discuss what factors would lead to the decision to use a longer or shorter valley curve based on gradient changes and nighttime visibility.
Consider how gradients impact perceived visibility and safety needs.
5 more questions in this section. Enroll free to practise them all.
Enroll free