01474925

Component

https://doi.org/10.3141/2355-03

http://scholar.google.com...lock&publication_year=2013

A fundamental concept of system engineering is defining operating objectives. Then the appropriate strategy and the performance measure for assessing how well the system is working are selected. Two operating objectives are broadly shared by many agencies: reliable communication with the traffic signal infrastructure and good allocation of green times. The first objective is oriented toward asset management and the second toward operational efficiency. However, substantial synergies exist between the objectives. The proposed performance measures can be used for evaluating whether these objectives are being met. The quality of communication is evaluated by an examination of connectivity and data completeness and is based on an open standard telecommunications model. Opportunities to improve green time allocation are detected through an identification of operating patterns in which some phases routinely force off and other phases gap out in the same cycle. The performance measures are presented in an easy-to-understand visual format that practitioners can use. One outcome of this system engineering approach is the realization that many objectives can be achieved with a high-latency, low-bandwidth communication infrastructure if the appropriate processing techniques and performance measures are clearly articulated. The architecture and performance measures are explained in the context of a deployment of 122 intersections geographically distributed throughout the state of Indiana; data were collected during a 2.5-month period with a communication infrastructure that included commercial cellular data and agency-owned fiber.

01495450

13-0980

English

pp 20-30

2013

Transportation Research Record: Journal of the Transportation Research Board

9780309286725

Print

Figures (10) ; References (13) ; Tables (3)

Green interval (Traffic signal cycle); Performance measurement; Systems engineering; Telecommunications; Traffic signal control systems

Indiana

Highways; Operations and Traffic Management; Safety and Human Factors; I73: Traffic Control

TRIS, TRB, ATRI

Feb 5 2013 12:18PM

• Coordinated Optimization of Signal Timings for Intersection Approach with Presignals
• Development and Use of Critical Functional Requirements for Controller Upgrade Decisions
• Increasing the Capacity of Signalized Intersections with Dynamic Use of Exit Lanes for Left-Turn Traffic
• Optimized Advance Detector Configuration for Option Zone Protection at High-Speed Signalized Intersections
• Probability Model for Understanding the Effects of Detector Delays on Right-Turn-on-Red Traffic
• Revisiting the Cycle Length: Lost Time Question with Critical Lane Analysis
• Simple Methodology for Estimating Queue Lengths at Signalized Intersections Using Detector Data
• Traffic Signal Timing Optimization: Choosing the Objective Function
• Two-Step Optimization Model for Dynamic Lane Assignment at Isolated Signalized Intersections