Weather Responsive Traffic Signal Operations: Setting ... AWS
Weather Responsive Traffic Signal Operations: Setting the Stage Kevin Balke, Ph.D., P.E. Texas Transportation Institute Deepak Gopalakrishna The Battelle Memorial Institute FHWA Talking Operations Webinar: Weather Responsive Traffic Signal Timing and Operations May 31st, 2012
Weather Responsive Traffic Management (WRTM) • Implementation of traffic advisory, control and treatment strategies • in direct response to, or in anticipation of, • developing roadway and visibility issues • that result from deteriorating or forecasted weather conditions Picture Source: Oregon Department of Transportation
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Types of WRTM Strategies • • • • • • • •
Advisories, Alert and Warnings Speed Management Strategies Vehicle Restrictions Route Restrictions Traffic Signal Control Strategies Traffic Incident Management Personnel/Asset Management Agency Coordination Picture Source: Oregon Department of Transportation
Developments in Weather Responsive Traffic Management Strategies • TTI, Battelle Institute, and McFarland Management • Contains: – Review of WRTM Strategies – Improvements to WRTM Strategies – WRTM ConOps – Evaluation Approaches and Procedures
• Available at FHWA Road Weather Management Website
Detectors and Detection Parameters • Issue: – Lane markings become obscured – Vehicle placement not in detection zones – Direct impact on detector performance – Detector parameters set based on assumed approach speeds
• Current operating strategy – Place recall on phase
• Potential advance strategies – Adjust detector settings to reflect slower operating speeds – Alternate detection zones
Vehicle and Pedestrian Clearance Intervals • Issues: – – – –
Increased stopping distances Reduced driver reaction times Reduced walking speeds Obscured signal indications
• Current operating strategies: – None
• Potential advance strategies – Adjust clearance intervals to reflect less than ideal conditions – Utilize dynamic clearance interval features in controllers
Weather‐Specific Timing Plan Strategies • Issues: – Progression schemes designed assuming ideal travel speeds – Unusual travel demands
• Common strategy – Deploy peak period timing plans
• Potential advance strategies – Weather‐specific coordination plans – Alternate phase patterns
Weather Responsive Signal Operations Concepts
WRTM Signal Operations in Practice • Mr. Shawn Gotfredson – City of Overland Park, Kansas
• Ms. Jamie Mackey – Utah Department of Transportation
Weather Responsive Traffic Management (WRTM) • Implementation of traffic advisory, control and treatment strategies • in direct response to, or in anticipation of, • developing roadway and visibility issues • that result from deteriorating or forecasted weather conditions Picture Source: Oregon Department of Transportation
2
Types of WRTM Strategies • • • • • • • •
Advisories, Alert and Warnings Speed Management Strategies Vehicle Restrictions Route Restrictions Traffic Signal Control Strategies Traffic Incident Management Personnel/Asset Management Agency Coordination Picture Source: Oregon Department of Transportation
Developments in Weather Responsive Traffic Management Strategies • TTI, Battelle Institute, and McFarland Management • Contains: – Review of WRTM Strategies – Improvements to WRTM Strategies – WRTM ConOps – Evaluation Approaches and Procedures
• Available at FHWA Road Weather Management Website
Detectors and Detection Parameters • Issue: – Lane markings become obscured – Vehicle placement not in detection zones – Direct impact on detector performance – Detector parameters set based on assumed approach speeds
• Current operating strategy – Place recall on phase
• Potential advance strategies – Adjust detector settings to reflect slower operating speeds – Alternate detection zones
Vehicle and Pedestrian Clearance Intervals • Issues: – – – –
Increased stopping distances Reduced driver reaction times Reduced walking speeds Obscured signal indications
• Current operating strategies: – None
• Potential advance strategies – Adjust clearance intervals to reflect less than ideal conditions – Utilize dynamic clearance interval features in controllers
Weather‐Specific Timing Plan Strategies • Issues: – Progression schemes designed assuming ideal travel speeds – Unusual travel demands
• Common strategy – Deploy peak period timing plans
• Potential advance strategies – Weather‐specific coordination plans – Alternate phase patterns
Weather Responsive Signal Operations Concepts
WRTM Signal Operations in Practice • Mr. Shawn Gotfredson – City of Overland Park, Kansas
• Ms. Jamie Mackey – Utah Department of Transportation
