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| 1.1 - Fatalities on state routes and interstates | 262 | 235 |  | WTSC, WSP, WSDOT, DOL | Traffic fatalities on state routes and interstates increased slightly from 232 in 2008 to 235 in 2009, but remained very low compared to 2007's 275 fatalities. Current trend is a decrease of 4.8 traffic fatalities per year. Data as of March 2010. |
| 1.2 - Serious injuries on state routes and interstates | | 1,013 | | WSDOT, WSP, WTSC, DOL | Serious injuries on state highways and interstates have declined. Preliminary collision data for 2008 show a total of 1,016 serious injuries on state routes and interstates compared to 1,116 in 2007. Data as of August 2009. |
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