1. Crash Analysis of Lincoln Way and Dakota Ave. Ames, IA
Vic Lund
Millie Hayes
April 18, 2007

2. N

4. Lincoln Way and Duff Ave. North Leg

5. Lincoln Way and Duff Ave. East Leg

6. Lincoln Way and Duff Ave. South Leg

7. Lincoln Way and Duff Ave. West Leg

8. 2001-2006 Lincoln Way and Dakota Ave. Crashes by Crash Severity
Year
Total
2001
2002
2003
2004
2005
2006
Major Injury 1 4
Minor Injury 2 3
Possible/Unknown
PDO 11 7 28 6 12 8 39
*2006 crashes are preliminary

9. 2001-2006 Lincoln Way and Dakota Ave. Crashes by Crash Manner
Year
Total
2001
2002
2003
2004
2005
2006
Non-collision 1 3
Rear-end 6 2 9
Angle, oncoming left turn 4 18
Broadside 7
Sideswipe, same direction
Unknown 12 8 39
*2006 crashes are preliminary

10. 2001-2006 Lincoln Way and Dakota Ave. Crashes by Major Cause
Year
Total
2001
2002
2003
2004
2005
2006
Ran Traffic Signal 2 1 6
FTYROW: Making right turn on red signal
FTYROW: Making left turn 3 12
FTYROW: From driveway
FTYROW: To pedestrian
FTYROW: Other (explain in narrative)
Driving too fast for conditions 4
Exceeded authorized speed
Made improper turn
Followed too close
Lost Control
Other/Unknown/Not Reported 5 8 39
*2006 crashes are preliminary

12. Probable Cause of Crashes
Pattern
Probable Cause
Left-turn head-on collisions
Large volume of left-turns
Restricted sight distance
Too short amber phase
Absence of special left-turning phase
Excessive speed on approaches
Rear-end collisions at signalized intersections
Slippery surface
Large number of turning vehicles
Poor visibility of signals
Inadequate signal timing
Inadequate roadway lighting

13. Countermeasures Left-Turn Head-On Crashes Rear-End Crashes
Reduce the speed limit on Lincoln Way
Revisit signal timing scheme
Rear-End Crashes
Install “Slippery When Wet” signs

14. Questions?