This summary report describes a study of freeway incidents and incident management strategies in the Seattle area. The study statistically analyzed the frequency and duration of freeway incidents on sections of I-5 and SR 520 in Seattle. In addition, a traffic simulation model was operationalized to assess the traffic related impacts of incidents. The findings show that Seattle-area incident management currently responds well to inclement weather and special events (e.g., major sporting games) but has problems with severe accidents. The ongoing operationalization of accident investigation sites and incident equipment storage sites can be expected to improve severe accident management, but response personnel training and the addition of more dedicated tow truck service are also needed. Finally, the study shows that, from a traffic impact perspective, the section of I-5 in downtown Seattle is in need of the most incident management attention.
September 21, 2007
Fred Mannering, Bryan Jones, Dan H. Garrison, Brad Sebranke, Lester Janssen.
Washington State Transportation Center (TRAC)
- # of Pages: 26 p., 460 KB (PDF)
- Subject: Accidents, Evaluation, Freeways, Guides to the literature, Impact studies, Literature reviews, Management, Special events, Statistical analysis, Time duration, Traffic incidents, Traffic simulation, Urban areas, Weather.
- Keywords: Incident evaluation, incident management, incident frequency, incident duration, traffic impacts, accident analysis, Seattle (Wash.), I-5, SR 520.
- Related Publications: Generation and Assessment of Incident Management Strategies. Volume I: Management, Surveillance, Control, and Evaluation of Freeway Incidents--A Review of Existing Literature, (WA-RD 204.2).
Generation and Assessment of Incident Management Strategies. Volume II: Analysis of Freeway Incidents in the Seattle Area, (WA-RD 204.3).
Generation and Assessment of Incident Management Strategies. Volume III: Seattle-Area Incident Impact Analysis--Microcomputer Traffic Simulation Results, (WA-RD 204.4).
Generation and Assessment of Incident Management Strategies. Volume IV: Seattle-Area Incident Management--Assessment and Recommendations, (WA-RD 204.5).
This abstract was last modified April 29, 2008