Two Phase At-Grade Enhanced Intersection "2pi" System created by: Belisario Hernandez Romo P.E., Ph.D. P.T.O.E., Ph. 858-3668128 All directional traffic movements plus pedestrian crossings are negotiated at the intersection in two phases per semaphore controlled cycle. Capacity is increased at least 200%

2. Higher capacity

4. Advance left turn crossover

5. Eliminate left turn conflicts at main intersectionMain Intersection Advance Intersection

6. Interstate 15 Bus Rapid Transit Two Phase Intersections – The Concept Main Intersection

7. Interstate 15 Bus Rapid Transit Two Phase Intersection – How does it work?

9. More red time

11. More green time

12. Much more capacity!3 1 4 2 2 1

14. Midwest

15. Other variations

16. Left turn separation2PI variation completed in 2006 on Airline Road in Baton Rouge, Louisiana NOTE: In 2002, 2PI concept received AASHTO’s "Francis B. Francois Award" in recognition of its contribution to transportation Detroit Left (Indirect Left Turn)

17. PERSON PERSON PERSON B A C 2 Phase Intersection Three typical crossing examples. Click page down button on keyboard when symbol below appears. 

18. PERSON A wishes to cross from here   to here. It will take two phases 

19. PERSON A PHASE 1 

20. PERSON A PHASE 2 

21. PERSON B wishes to cross from here  to here  It will take two phases 

22. PERSON B PHASE 1 

23. PERSON B PHASE 2 

24. PERSON C wishes to cross from here   to here. It will take three phases 

25. PERSON C Phase 1 

26. PERSON C Phase 2 

27. PERSON C Phase 3 

28. PERSON PERSON PERSON B A C 2 Phase Intersection Three typical crossing examples animated simultaneously. 

29. Phase 1 

30. Phase 2 

31. Phase 3 End

32. Mira Mesa Boulevard: Two Phase Enhanced At-Grade Intersection 2PI Details

35. Residential area

37. Forecast (year 2030):

38. 7,573 vehicles per hour (AM)

39. 9,201 vehicles per hour (PM)

41. Commercial Area

44. T-intersection