This study evaluates the performance of an adaptive traffic signal control system (ATSCS) based on license plate recognition (LPR) detector data. The LPR detector data can provide abundant individual vehicle-based information for comprehensive, detailed evaluation of traffic signal control. Several measurements including travel time delay, cumulative travel time frequency diagram, Purdue coordination diagram, 95th percentile travel time, and buffer index are applied to reveal the various aspects of traffic signal control performance. A before and after comparison was conducted in the eastbound direction of a road segment, in which the ATSCS was deployed in October 2016 while the time-of-day traffic signal planning was used previously. Results show the improvement in traffic condition in the morning and evening peaks after the deployment of the ATSCS. However, the traffic condition at midnight worsened on certain days after the deployment of the ATSCS.

Chapter Contents:

• 13.1 Introduction
• 13.2 Methodology
• 13.2.1 Travel time delay
• 13.2.2 Travel time-based measurements
• 13.2.2.1 Scatter diagram of travel time (delay)
• 13.2.2.2 Cumulative frequency diagram of travel time
• 13.2.3 PCD and related indexes
• 13.2.4 Travel time reliability indexes
• 13.2.4.1 The 95th percentile travel time
• 13.2.4.2 Buffer index
• 13.3 Case description and dataset
• 13.3.1 Case description
• 13.3.2 Dataset
• 13.4 Results
• 13.4.1 Evaluation of travel time delay
• 13.4.1.1 Scatter diagram analysis of travel time delay
• 13.4.1.2 Quantitative analysis of travel time delay improvement
• 13.4.2 Cumulative frequency diagram of travel time
• 13.5 Evaluation of the PCD
• 13.5.1 Travel time reliability evaluation
• 13.5.1.1 The 95th percentile travel time
• 13.5.1.2 Buffer index
• 13.6 Conclusion
• Acknowledgments
• References

Inspec keywords: road vehicles; traffic engineering computing; road traffic control

Other keywords: traffic condition; abundant individual vehicle-based information; license plate recognition detector data; comprehensive evaluation; multiday evaluation; time-of-day traffic signal planning; adaptive traffic signal control system; Purdue coordination diagram; LPR detector data; adaptive traffic signal system; travel time delay; percentile travel time; traffic signal control performance; ATSCS; cumulative travel time frequency diagram

Subjects: Other topics in statistics; Traffic engineering computing; Road-traffic system control