CE463 Lecture 22 Signal Timing

1. CE463 Lecture 22Signal Timing Text: class notes HCM 2000, Chapters 10 and 16

2. Volume Ratio and Green Allocation

3. Critical Lane Group

4. Average Green for a Phase Assumptions Signal cycle is C The actuated controller maintains xc in the critical lane group for the phase Average effective green for the phase is where (v/s)c is the volume ratio for the critical lane group and gmin is the minimum effective green

5. Average Signal Timing for a Full-Actuated Controller

6. Average Signal TimingFull-Actuated Controllers

7. Example

8. Example

9. Example

10. Example

11. Example

12. Example

13. Example

14. Average Signal TimingSemiactuated Controllers

15. Example

16. Example

17. Minimum Green Constraint Calculate average signals using the methods already introduced If one or more green times are shorter than minimum, select the phase with the smallest gi/gmini and set gi=gmini Remove this phase from the sequence of phases and increase the total lost time in cycle by gmini Repeat step 1 and then steps 2 and 3 if needed

18. Example

19. Example

20. Example

21. Example

22. Maximum Green Constraint Calculate average signals using the methods already introduced If one or more green times are longer than the maximum, select the phase with the largest gi/gmaxi and set gi=gmaxi Remove this phase from the sequence of phases and increase the total lost time in cycle by gmaxi Repeat step 1 and then steps 2 and 3 if needed

23. END