Agenda. Morning. TS2 Cabinet Components and Operation. Traffic Signal Ring Structure. Afternoon. Basic Preemption/Priority

Transcription

1 Agenda Morning Traffic Terminology TS2 Cabinet Components and Operation Traffic Signal Phasing Traffic Signal Ring Structure Understanding a Signal Plan Controller Programming Afternoon Basic Coordination Basic Time of Day Basic Preemption/Priority Event/Alarm Log Troubleshooting Chuck Bluto Chuck Bluto Jim Decker Jim Decker Gary Maccarone Gary Maccarone Gary Maccarone Gary Maccarone Chuck Bluto Jim Decker Jim Decker

2 Topics Traffic Signal Phasing Traffic Signal Ring Structure Traffic Signal Overlaps

3 Traffic Signal Phasing Definition of a Phase Phase Outputs Phase Inputs

4 Traffic Signal Phasing What is a Phase? A phase is a movement of vehicle or pedestrian traffic.

5 Traffic Signal Phasing What is a Phase? A Phase consists of three parts: Outputs, Inputs, and Timing intervals. A Phase has a place in the ring structure of a controller unit.

6 Traffic Signal Phasing Outputs A Phase provides output displays for Vehicle & Pedestrian Signals A Phase provides status information for controller unit sequencing

7 Traffic Signal Phasing Inputs A Phase provides inputs for vehicle and pedestrian actuation A Phase also provides inputs for modifying its sequence and timing behavior

8 Timing Traffic Signal Phasing A Phase provides green timing for vehicle and pedestrian movements Vehicle timing includes minimum, passage, maximum, and volume density Pedestrian timing includes walk, advance walk, and delay walk timing A Phase also provides clearance timing for vehicle and pedestrian movements Clearance timing includes yellow, red, and don t walk timing

9 Timing Traffic Signal Phasing Walk time This is the time given to the Walk indication on the pedestrian signal. This is not necessarily the time required to cross the street.

10 Timing Traffic Signal Phasing Pedestrian Clearance Time This is the time given to the flashing Don t Walk indication on the pedestrian signal. This is usually the time required for an average pedestrian to cross the particular street.

11 Timing Traffic Signal Phasing Minimum Green Time The time that must be met for any particular phase before that phase will stop timing the green interval and move to the yellow interval of that phase s timing.

12 Timing Traffic Signal Phasing Passage time Time given to a lack of detection on a phase that when met will cause the controller to stop timing the green interval of the phase and move to the clearance interval.

13 Timing Traffic Signal Phasing Maximum Time 1 This is the maximum time the controller will time a green interval, at which time the controller will exit the green and move to the yellow interval.

14 Timing Traffic Signal Phasing Maximum Time 2 This is a second maximum time which can be selected either remotely or through TBC functions.

15 Timing Traffic Signal Phasing Alternate Maximums These are additional maximum times which can be selected through TBC functions. Maximum 3,4,5 Dynamic Maximums 3,4,5

16 Timing Traffic Signal Phasing Yellow Clearance Time This is the time for the yellow interval.

17 Timing Traffic Signal Phasing Red Clearance Time This is the time for the red clearance interval.

18 Recall Traffic Signal Phasing A term used that indicates that the controller will service a phase whether or not detection is being supplied from detectors. This allows the controller to cycle in the absence of detection. There are several different types of recalls. Min Recall Tells the controller only to time to MGRN. Max Recall Tells the controller to time to a Max time set. Non Act This is a recall back to a non-actuated phase. Some phases have detection or are actuated, some phases do not have detection and are called non-actuated. Soft Recall This is a call back to the coordinated phase only if there is an absence of calls on the side street. This has specific applications. Pedestrian Recall A call to an actuated pedestrian movement. Non Act Pedestrian Recall A recall to a non-actuated pedestrian movement. Non Act + Pedestrian Recall A recall to a non-actuated pedestrian movement allowing maximum walk time within the available phase maximum time.

19 Traffic Signal Overlaps What is an Overlap? An Overlap is a movement of vehicles or pedestrians comprised of one or more phases Overlaps are defined by parent phases and have no place in the ring structure Overlaps may have fixed timing for delayed clearances Overlaps are generally identified using letters, while phases are identified using numbers

20 Traffic Signal Overlaps O 6 O 6 O 1 O 2 O 2 O 4 OL A OL A = 1+4

21 Traffic Signal Overlaps Overlaps The parent phase may exist just for the purpose of driving the overlap. Termed a Dummy Phase. Phases must not have a concurrent phase that would be conflicting to the Overlap movement. In this example even though phase 7 would not conflict with the right turn of Overlap A, Phase 3 (a concurrent movement) would. Phase 4 is OK, phase 3 and 8 are concurrent and don't conflict with the right turn.

22 Traffic Signal Overlaps 8 3 O 1 O 2 O 3 O R1 2 R2 7 A=1+4 O 5 O 6 O 7 O 8 8 Phase Quad Ring Structure Overlap A parent phases 4

23 Ring Structure What is a Ring? A ring consists of two or more sequentially timed and individually selected conflicting phases so arranged as to occur in an established order Multiple rings may run concurrently in a traffic controller

24 Ring Structure Dial (or Cycle) R1 O 1 O 2 O 3 O 4 R2 O 5 O 6 O 7 O 8 Time Cycle Length

25 Ring Structure Through Movements Even numbers starting with heaviest movement Left Turn Movements Odd numbers one less than opposing through movement designation NEMA Phasing Convention Heaviest Movement 7 4

26 Ring Structure Ring Structures The configuration of the phases for the Intersection is based upon the Intersections ring structure. The separation of concurrent phases is designated by the ring barrier.

27 Ring Structure Barrier A barrier is a reference point in the sequence of a multi-ring Controller Unit at which all rings are interlocked. Barriers assure there will be no concurrent selection and timing of conflicting phases for traffic movement in different rings.

28 Ring Structure Barrier O 1 O 2 O 3 O 4 R1 R2 O 5 O 6 O 7 O 8 8 Phase Quad Ring Structure

29 Ring Structure Phases are identified within the ring structure as being Concurrent or Non-Concurrent phases.

30 Ring Structure Each phase can time with other phases in the other ring, and on the same side of the barrier, but can not time with any phase within its own ring, (i.e. 1 can time with 5 and 6, but not with 2, 3, 4, 7 or 8). If any other combination occurs, this is called a conflict.

31 Ring Structure The following diagrams identify Concurrent and Non-Concurrent phases within a standard 8 phase quad based on a selected phase.

32 Ring Structure Selected Phase O 1 O 2 O 3 O 4 R1 R2 O 5 O 6 O 7 O 8 8 Phase Quad Ring Structure Concurrent Phases

33 Ring Structure Selected Phase O 1 O 2 O 3 O 4 R1 R2 O 5 O 6 O 7 O 8 8 Phase Quad Ring Structure Concurrent Phases

34 Ring Structure Selected Phase O 1 O 2 O 3 O 4 R1 R2 O 5 O 6 O 7 O 8 8 Phase Quad Ring Structure Concurrent Phases

35 Ring Structure O 1 O 2 O 3 O 4 Selected Phase R1 R2 O 5 O 6 O 7 O 8 8 Phase Quad Ring Structure Concurrent Phases

36 Ring Structure O 1 O 2 O 3 O 4 R1 R2 Selected Phase O 5 O 6 O 7 O 8 8 Phase Quad Ring Structure Concurrent Phases

37 Ring Structure O 1 O 2 O 3 O 4 R1 R2 Selected Phase O 5 O 6 O 7 O 8 8 Phase Quad Ring Structure Concurrent Phases

38 Ring Structure O 1 O 2 O 3 O 4 R1 R2 O 5 O 6 O 7 O 8 8 Phase Quad Ring Structure Concurrent Phases Selected Phase

39 Ring Structure O 1 O 2 O 3 O 4 R1 R2 O 5 O 6 O 7 O 8 8 Phase Quad Ring Structure Concurrent Phases Selected Phase

40 Ring Structure Selected Phase O 1 O 2 O 3 O 4 R1 R2 O 5 O 6 O 7 O 8 8 Phase Quad Ring Structure Non-Concurrent Phases

41 Ring Structure O 1 O 2 O 3 O 4 R1 R2 Selected Phase O 5 O 6 O 7 O 8 8 Phase Quad Ring Structure Non-Concurrent Phases

42 Phase One Phase Two Phase Three Phase Five Phase Six Phase Seven Output Signal Ocean State Signal Co.

43 PHASING DIAGRAM East-West Barrier North-South φ φ φ φ 4 φ5 φ φ 6 7 φ 8 Ocean State Signal Co.

44 PHASING DIAGRAM t East-West Barrier North-South φ φ φ φ 4 φ5 φ φ 6 7 φ 8 Output Signal Ocean State Signal Co.

45 PHASING DIAGRAM t East-West Barrier North-South φ φ φ φ 4 φ5 φ φ 6 7 φ 8 Output Signal Ocean State Signal Co.

46 PHASING DIAGRAM t East-West Barrier North-South φ φ φ φ 4 φ5 φ φ 6 7 φ 8 Output Signal Ocean State Signal Co.

47 PHASING DIAGRAM t East-West Barrier North-South φ φ φ φ 4 φ5 φ φ 6 7 φ 8 Output Signal Ocean State Signal Co.

48 PHASING DIAGRAM East-West Barrier t North-South φ φ φ φ 4 φ5 φ φ 6 7 φ 8 Output Signal Ocean State Signal Co.

49 PHASING DIAGRAM East-West Barrier t North-South φ φ φ φ 4 φ5 φ φ 6 7 φ 8 Output Signal Ocean State Signal Co.

50 PHASING DIAGRAM East-West Barrier t North-South φ φ φ φ 4 φ5 φ φ 6 7 φ 8 Output Signal Ocean State Signal Co.

51 PHASING DIAGRAM East-West Barrier t North-South φ φ φ φ 4 φ5 φ φ 6 7 φ 8 Output Signal Ocean State Signal Co.

52 O S PHASING DIAGRAM East-West Barrier North-South t φ φ φ φ 4 φ5 φ φ 6 7 φ Ocean State Signal Co.

53 PHASING DIAGRAM t East-West Barrier North-South φ φ φ φ 4 φ5 φ φ 6 7 φ 8 Output Signal Ocean State Signal Co.

54 Coordination Cycle A signal cycle is one complete rotation through all of the phases in a ring. In general, every legal vehicular or pedestrian movement receives a green indication once within each cycle, although there are some exceptions to this rule. Cycle Length The cycle length is the time that it takes a signal to complete one full cycle of indication.

55 Coordination Diagram of Ring 1 with 100 second cycle length. For an 8 phase quad, Ring 1 and Ring 2 would overlap one on top of the other. Ring second cycle length 30 sec 23 sec 4 0 sec 1 13 sec 20 sec 75 sec 25 sec 20 sec 2 13 sec 3 23 sec 30 sec 50 sec

56 Coordination Split The segment of the cycle length allocated to each phase or interval that may occur. In an actuated controller unit, split is the time in the cycle allocated to a phase. Green time + clearance intervals (yellow and red).

57 Coordination Split Phase 1 End R1 O 1 O 2 O 3 O 4 R2 O 5 O 6 O 7 O 8 Time Phase 1 Split Time

58 Split Coordination Illustration of Phase 1 with a split time of 20 seconds. 0 sec 75 sec sec 20 sec 25 sec 13 second green time + 7 second clearance interval (yellow and red) sec

59 Split Coordination Split times should run such that time between barriers is equal from ring to ring. Sum of phase 1 and 2 should be the same as the sum of phases 5 and 6 because they are on the same side of a barrier in different rings. R1 R2 O 1 O 2 O 3 O 4 O 5 O 6 O 7 O 8 8 Phase Quad Ring Structure

60 Coordination Offset Offset is the time relationship, expressed in seconds or percent of cycle length, determined by the difference between a defined point in the coordinated green and a system reference point. Offset values assist in coordinating Intersections along an arterial by creating a Green Band.

61 Offset Coordination In coordinated operation, every intersection will reference a background clock representing the cycle length. The moment in time in which the green for the coordinated phase begins (or ends) is the determined by the value of the offset.