Professional Courses
Industry-relevant training in Business, Technology, and Design to help professionals and graduates upskill for real-world careers.
Categories
Interactive Games
Fun, engaging games to boost memory, math fluency, typing speed, and English skills—perfect for learners of all ages.
Typing
Memory
Math
English Adventures
Knowledge
Enroll to start learning
You’ve not yet enrolled in this course. Please enroll for free to listen to audio lessons, classroom podcasts and take practice test.
Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
What characterizes a valley curve?
💡 Hint: Think about the shape of a 'U'.
Question 2
Easy
What factor greatly affects visibility on valley curves at night?
💡 Hint: What do drivers depend on when driving at night?
Practice 4 more questions and get performance evaluation
Interactive Quizzes
Engage in quick quizzes to reinforce what you've learned and check your comprehension.
Question 1
What type of curve is a valley curve?
- Concave
- Convex
- Linear
💡 Hint: Think about the shape that resembles a valley.
Question 2
True or False: Valley curves are only a concern during the daytime.
- True
- False
💡 Hint: Consider how visibility changes at different times of day.
Solve 1 more question and get performance evaluation
Challenge Problems
Push your limits with challenges.
Question 1
A road with a descending gradient of 1 in 20 meets a flat section. Determine the length of the valley curve needed to ensure comfort at 70 km/h with SSD of 150 m under nighttime conditions.
💡 Hint: Review both comfort rate and adequate sight distance calculations.
Question 2
Analyze the impact of an improperly designed valley curve that ignores minimum sight distance at night. What accidents might occur, and how can they be prevented?
💡 Hint: Consider referencing visibility distances and headlight capabilities.
Challenge and get performance evaluation