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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
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Final GMAP Reports > 5. Transportation > Transportation Final 10-15-09 > 3. Mobility > 3.2 - Average Time to Clear Major Incidents
 

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
Relevance:
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.

 
Extended Analysis and Action Plan