40.4.3 - Entry, exit and island radius
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
What is the purpose of the entry radius in a rotary?
💡 Hint: Think about how curves influence driving speed.
Why should the exit radius be larger than the entry radius?
💡 Hint: Consider traffic flow efficiency.
4 more questions available
Interactive Quizzes
Quick quizzes to reinforce your learning
What should be the ideal speed for vehicles at the entry of an urban rotary?
💡 Hint: Reflect on speed limits discussed in the section.
True or False: The exit radius should generally be less than the entry radius.
💡 Hint: Think about traffic flow dynamics.
1 more question available
Challenge Problems
Push your limits with advanced challenges
Design a rotary for a suburban area where the approaching traffic volume is moderate. Discuss how you would determine the entry and exit radii based on expected speed limits and pedestrian traffic.
💡 Hint: Consider ratios and pedestrian flow discussed in the text.
Analyze the relationship between the entry and exit radii in a busy urban rotary and propose measurements based on the design requirements of reducing speed and accommodating heavy traffic.
💡 Hint: Look at the problem from both a safety and flow perspective.
Get performance evaluation
Reference links
Supplementary resources to enhance your learning experience.