1. Sarah Tracy, P.E., PTOE Assistant Traffic Engineer
Dakota County, MN Comprehensive Approach to Safety Through the CIP Process
Sarah Tracy, P.E., PTOE
Assistant Traffic Engineer

2. Dakota County, MN

3. Dakota County, MN Minnesota’s 3rd-most Populous County Population
1990: 275,000
2000: 356,000 (+29%)
2010: 400,675 (+13%)
2030: 520,000 (+30%)

4. Dakota County, MN 424 centerline miles/1,080 lane miles
Principal Arterial
18 miles (4%)
Minor Arterial
212 miles (50%)
Collector
180 miles (42%)
Local
14 miles (4%)
250 traffic signals

5. Capital Improvement Program?

6. Annual Process Listings: Intersection Crashes
Intersection Traffic Control Assessment
Aging Signal System
Other:
County Roadway Safety Plan (MnDOT)
City & citizen concerns
Studies
Signal revisions
Overlays

7. Intersection Crash Listing
MnCMAT Program
Criteria:
5 crashes current year
10 crashes in most recent 3 years

8. Intersection Crash Listing
TIER 1
# of crashes 2013 to 2015
3-year total
Crash rate & state average
Severity Rate & state average
Critical crash rate & crash rate index
Rank by crash rate (may change)

9. Intersection Crash Listing

10. Intersection Crash Listing

11. Intersection Crash Listing
TIER 2
Assess Top ~50 intersections
Develop crash listings/diagrams as needed to ID trends
ID Tier 3 locations

12. Intersection Crash Listing
TIER 3
Detailed assessment
ID CIP projects

13. Intersection Traffic Control Assessment
Non-Signalized Intersections
Signal Warrants
Field and Safety Reviews

14. Intersection Traffic Control Assessment
Warrants met
Volume warrants points (ranking)
Crash listing rank
Traffic control comments
Evaluate?
CIP recommendation

15. Aging Signal System Listing
Full reconstruction date
2017 age
Crash ranking
Maintenance Issues
Recommended action

16. CIP Traffic Recommendations

17. CIP Meetings with Cities

18. CIP Meetings with Cities

19. Capital Improvement Program

20. Capital Improvement Program