1. Examination of Collision Data to Avoid Accident Hot Spots
Yegor Malinovskiy
Kelly Pitera
Yao-Jan Wu
December 8, 2006

2. Objectives Examine the frequency of collisions along state highways
Map several routes from Federal Way to
Kenmore
1. Distance
2. Safety
3. Distance & Safety (DIST/100+ACC)

3. Data Used King County Tract Area State Highways
State Route Milepost Markers
Collision Data: WSDOT Incident
Tracking System (WITS)

4. Analysis Intersect Frequency Join Merge Spatial Join
Network Analyst (To/From Node, Link
Costs, Solve)

5. Results Frequency: 1. Higher frequency near downtown
2. Fewer accidents on I-90 (vs SR 520)
3. No freeway is completely free of
accidents

6. Results
Frequency:

7. Results Routes from Federal Way to Kenmore: 1. Distance: I-5, SR 522
2. Safety: SR 18, I-90, I-405, SR 522
3. Distance & Safety: SR 18, SR 167,
I-405, SR 522

8. Results
Distance: I-5, SR 522

9. Results
Safety: SR 18, I-90, I-405, SR 522

10. Distance & Safety: SR 18, SR 167, I-405, SR 522
Results
Distance & Safety: SR 18, SR 167, I-405,
SR 522

11. Conclusions Many accidents on Interstate 5 through
downtown Seattle because of higher
volume of traffic
More accidents on SR 520 because of lack
of shoulders
Taking the “safest” route is not practical
Many other factors contribute to the actual
likelihood of getting into an accident

12. Thank you.
Any Questions?