Post on 18-Jan-2016
INTERSECTION WARNING SYSTEMS
Jon JackelsMn/DOT ITS Program Engineer
Traffic TopicsApril 7, 2011
Rural Stop Controlled Intersection Crashes
FATAL CRASHES
• Right angle crashes overrepresented at rural STOP controlled intersections.
• Most of the fatal crashes are stop and proceed.
• Strategies to address include use of new technologies.
Urban13%
Rural23%
Non-Intersection
64%
Primary cause where drivers stopped before entering:• Driver looked but did not see other vehicle (62.1%);• Driver misjudged the gap (lag) (19.6%);• Driver had obstructed view (14.0%), or• Roads were ice-covered (4.4%)
The first 3 are problems with lag detection or selection.
Intersection Crashes – Driver Error
• Major Roadway Warning Systems– Vehicle Crossing / Entering Mainline– Speed Warning
• Minor Roadway Warning Systems– Mainline Vehicle Approaching Cross Street– Cross-street Stop Sign Warning Systems– Cross-street Gap Assistance Systems
Dynamic Intersection Warning Systems
Major Roadway Warning
Vehicle Entering or Crossing
Major Roadway Warning
Speed Warning
Minor Roadway WarningMainline Vehicle Approaching Cross Street
Minor Roadway Warning
Cross Street STOP Sign Warning
Minor Roadway Warning
Cross-Street Gap Assistance System
Challenges
• Establish the safety impact• Continue development of intersection warning
systems• Develop a methodology to identify risk• Establish warrants for proper applications• Implement MUTCD standards and guidelines• Educate and inform drivers.• Focus enforcement efforts.
• FHWA Pooled Fund Study since 1991• 16 members (including Ontario and Dutch Ministry
of Transport)• Forum for collaborative ITS research, development,
and deployment ventures• Facilitates the sharing of technological and
institutional experiences gained from individual ITS projects from its members
ENTERPRISE PROJECT
• ENTERPRISE Pooled Fund Members• States with ICW Systems• NCUTCD – Committee on Warning and Guide
Signs• AASHTO – Sub-Committee on Traffic Engineering• NACE• FHWA
PROJECT STAKEHOLDERS
STATES WITH ICW SYSTEMS• Florida• Louisiana• Maryland• Michigan• Minnesota• Mississippi• Missouri• Maine
• North Carolina • Ohio• Pennsylvania• South Carolina• Virginia• Washington• Wisconsin
Bring together the agencies and individuals who have deployed ITS intersection warning systems to reach consensus on an approach for an accelerated uniform deployment of intersection warning systems, and a recommendation for inclusion in the MUTCD.
Two workshops are proposed to accomplish these tasks.
PROJECT PURPOSE
• Share knowledge and educate each other on systems deployed;
• Identify problems, issues, successes with deployments; and
• Identify action items for each workshop attendee to perform in preparation for the second workshop.
WORKSHOP #1
• Establish a process to facilitate inclusion of the systems identified into the federal MUTCD;
• Establish a process to facilitate development of application warrants for the systems; and
• Establish appropriate measures of effectiveness and data needs for each system type to facilitate direct comparison of systems regardless of jurisdiction.
WORKSHOP #2
• Comprehensive List of Deployed Intersection Systems
• Workshops to learn from others and develop consensus on revisions to the MUTCD
• Recommended Application Guidelines for Intersection Warning Systems
ANTICIPATED RESULTS