ADAPTIVE SIGNAL CONTROL TECHNOLOGY

Transcription

1 ADAPTIVE SIGNAL CONTROL TECHNOLOGY

2 Design Operations Maintenance

3 Current Practice

4 Improving The Practice Planning for Operations RTSOPs Resources Documentation Basic Service Concept Traffic Signal Timing Manual National Traffic Signal Training Curriculum Training

5 Key Message ASCT Improves Performance Delivers Better Service to Road Users Solves Problems for Signal Operators Provides Value Intro How it Works Performance ACSLite Considerations Implementation

6 Opportunities to Improve Traditional Traffic Signal Timing PEAK 15 Min VPH (vehicles per hour) AM 12:00 AM 2:00 AM 4:00 AM 6:00 AM 8:00 AM 10:00 AM 12:00 PM 2:00 PM 4:00 PM 6:00 PM 8:00 PM 10:00 PM Time of Day

7 Variability is Normal 500 PM Peak Period Demand PEAK 15 Min 450 Demand (VPH) NBLT SB WBLT 300NB 250 EB WB Time

8 Sensors monitor traffic What is ASCT? Adaptive Signal Control Technology Process repeats Software evaluates performance Timing updated if necessary Intro How it Works Performance ACSLite Considerations Implementation

9 What is ASCT? Process repeats Sensors monitor traffic Software compares to baseline timing plan Sensors Type Placement Effective Well-maintained Timing change if necessary Intro How it Works Performance ACSLite Considerations Implementation

10 What is ASCT? Process repeats Sensors monitor traffic Software compares to baseline timing plan Evaluate Performance Data Timing Parameters Algorithms & Models Frequency of Analysis Timing change if necessary Intro How it Works Performance ACSLite Considerations Implementation

11 What is ASCT? Sensors monitor traffic Update Timing Uncongested Splits Offset Cycle Process repeats Software compares to baseline timing plan NB 250 PM Peak Period Demand Demand (VPH) EB NBLT WB SB WBLT 3:00-3:15 3:15-3:30 3:30-3:45 3:45-4:00 4:00-4:15 4:15-4:30 4:30-4:45 4:45-5:00 5:00-5:15 5:15-5:30 5:30-5:45 5:45-6:00 6:00-6:15 6:15-6:30 6:30-6:45 6:45-7:00 Time Timing Updates if necessary Intro How it Works Performance ACSLite Considerations Implementation

12 What is ASCT? Process repeats Sensors monitor traffic Software compares to baseline timing plan Continuous Monitoring 24/7 Weekdays, Weekends Holidays Special Events Incidents Timing change if necessary Intro How it Works Performance ACSLite Considerations Implementation

13 Benefits of ASCT Road Users Improved Travel Time Reliability Lower fuel consumption Safety System Operators Continuous Performance Monitoring Fewer complaints Provides Value Labor cost for retiming & operations Cost of Congestion Reduced Emissions

14 The Benefits of Retiming Traffic Signals Local Example: 1400 Travel Time (hrs/day) $2500/day $1.25M/2 yrs $2000/day $1.00M/2 yrs $1200/day $0.6M/2 yrs Total 0 07/03 07/05 07/07 07/09 Source: City of Alpharetta, GA

15 Improving on Good Practice with ASCT 1400 Travel Time (hrs/day) $2500/day $2000/day $1200/day $0.6M/2 yrs $0.5M/2 yrs $0.3M/2 yrs A = ½ b x h $1.4 M/6 yrs Total 0 07/03 07/05 07/07 07/09 Source: City of Alpharetta, GA

16 ASCT Deployment Status RHODES ACSLite InSync SCATS SCOOT LA ATCS OPAC State with Pending ASCT State with Active ASCT

17 Barriers to ASCT Uncertainty about benefits Complexity Cost

18 The Vision Adaptive Signal Control Technology (ASCT) is utilized as an operations strategy to improve the performance of traffic signal timing to reduce congestion where demand conditions and agency capabilities support its implementation.

19 EDC ASCT Goals Goal 1 By December 2011, ACSLite will be comprehensively evaluated and demonstrated to underscore the opportunities and benefits of using Adaptive Control Technology

20 EDC ASCT Goals Goal 2 By December 2012, ASCT / EDC tools will be used by 40 agencies to guide programming and / or implementation of adaptive signal control strategies and systems.

21 The Plan FHWA ACTIVITY Comprehensive evaluation of ACSLite Systems TX, MD, OH, MD Development of Implementation Tools Incorporate ASCT as an operations strategy in Agency Design and Operations Guidance Identify and Fund ASCT on Transportation Improvement Plans

22 Next Steps ACSLite Evaluations TX, MD, OH, CA ASCT/EDC Tools Guidance Document NHI Course Technical Assistance Federal Register Notice 3 ACSLite Demonstration Sites Outreach, Training, Technical Assistance

23 Breakout Session Overview What is ASCT Where ASCT is most effective Benefits of ASCT Implementation approach & support Next steps