1. BACKGROUND METHODOLOGY RESULTS OBJECTIVES CONTACT
Cloud-based Traffic Signals Synchronization Tool for Multiple Paths
Dahai Han, Zihao Jin, Weijie Tan
Faculty Advisor: Dr. Yue Liu
BACKGROUND
METHODOLOGY
RESULTS
Movement-based signal timing plan
Convert phase-based signal timing plan into movement-based so that each turning flow can be presented independently.
Offset optimization
Common cycle length assumed
Mixed integer linear programming problem
Cloud deployment
Open source geographic data
Google Maps API
Click on intersections to choose path
Traffic signal control is considered as an efficient way to relief traffic congestions. Traffic signals permit conflicting streams of traffic to share the same intersection by means of time separation. However, signals may interrupt extremely heavy flows to permit the crossing of minor movements that could not otherwise move safely through an intersection.
Signals synchronization, or known as green wave progression, gives the major traffic flow - typically one-way or two-way along an arterial - all green lights for a series of intersections and reduces times of stops of vehicles.
Figure 5. Network layout and Pre-determined Signal Timing Plan
Table 1. Optimization Results
Path
Weight
Bandwidth(s)
Intersection
Offset(s) 1
0.2 6 2
0.4 4 24 3
0.1 7 37
0.5 47 5 35 48
0.3 44 38
Objective Value -
20.2
Figure 1. Signals Synchronization
Figure 3. Phase-based and Movement-based Signal Timing Plan
OBJECTIVES
To obtain progressions on multiple paths to
Maximize green band
Decrease times of stops of vehicles
Reduce traffic delay
Prevent congestion spillback
To provide a SaaS tool to
Visualize green wave with different designs
Test different signal timing plans
Maximize weighted overall green band
s. t.
Figure 6. Illustration of Progression on Path 1
Figure 2. Time-space Diagram of Two-way Progression
CONTACT
INFORMATION
Figure 4. Movement-based Progression
Dahai Han
Ph. D. Candidate, Teaching Assistant
Department of Civil and Environmental Engineering
University of Wisconsin-Milwaukee
Figure 7. Illustration of More Options for Output