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Transportation Final 10-15-09 -   3.2 - Average Time to Clear Major Incidents

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Transportation Final 10-15-09
1. Safety
2. Preservation
3. Mobility
4. Environment
5. Stewardship
Current Conditions
6. Economic Recovery

3.2 - Average Time to Clear Major Incidents - WSP, WSDOT, WTSC

Why is the percentage of incidents involving Commercial Motor Vehicles declining at such a high percentage?

Data Notes
Data Source: Washington State Patrol and WSDOT Traffic Office, as of June 2009.

Measure Definition:

Reduce the average duration of 90-minute-and-longer blocking incidents on 9 key highways in Washington State.  In 2008, the agencies created a goal of 155 minutes. 

Target Rationale:

WSP and WSDOT are working collaboratively towards reducing the average over-90 minute response time to 155 minutes for nine key corridors in western Washington.

Link to Agency Strategic Plan:
WSP Priority 1.2
Notes: (optional)
Key Highway Segments: I 5 (Oregon to Canadian border), I 90 to North Bend, I 405, SR 18 to I 90, SR 16 to Purdy, SR 167, SR 520, SR 512, and I 205
Also Available
Action Plan: Yes
Extended Analysis: Yes

 Summary Analysis

  • The percentage of over-90-minute incidents involving commercial motor vehicles has been at historically low levels in the previous quarters. These incidents have accounted for approximately 35% to 50% of all over-90-minute incidents in a quarter for the nine key routes, averaging 43% for all incidents between 2006 and 2008; on average, they take 21% more time to clear. Last quarter, these vehicles were only involved in 28% of over-90-minute incidents, and this quarter the proportion again remained lower, at 26%.
  • The annualized, average time for clearing 90-minute-and-over incidents was 154 minutes in Q2, which is below the 155-minute target.
  • The second quarter of 2009 saw 72 over-90-minute incidents on the nine key routes.

Key Action Items 

           Quarter 2, 2009 Extraordinary Incidents

  • WSP and WSDOT experienced three extraordinary (6+ hour) incidents in Q2 2009. Continuing a pattern seen  in past reports, these incidents involved commercial motor vehicle events, fatalities, and multiple complicating factors.
  • After debriefing from one of the CMV incidents, responders determined that better up-front coordination with the tow company and cargo owner could shorten the length of the closure by ensuring they bring the correct equipment for the incident.