1. Intersection Safety Improvement Toolbox
Presented by:
Steve Tindale, P.E., AICP
July 29, 2004

2. Too Many People are Dying! Fix the Traffic Safety Problem.

3. Where Do You Want Me to Start?!
Sure Buddy…
Where Do You Want Me to Start?!

4. This is Not the time to analyze procedures.

5. Topics Not Covered: Collecting Geometric & Traffic Data
Developing Crash Rate Categories
Benefit-Cost Analysis/Crash Reduction Factors
Specific Engineering Solutions
One Size Fits All Methodology

6. Data Collection & Analysis For Improved Operations
…Will Provide a General Approach to:
Crash Data Collection
Management of Crash & Related Data
Analysis of Crash Data

7. Data Collection & Analysis For Improved Operations
Complete Process
In-Vehicle Data Capture
Scanned Reports/ Validated Data Entry
GIS Location

8. Data Collection: Complete Process
1st Response Agency
Complete Hardcopy Form
Onboard Data Entry
GPS
Data Validation ???
Scan Report
Transcribe Hardcopy
Heads-Up/Validated Data Entry
Crash Report Image Archive
Crash Database

9. Data Collection: In-Vehicle Data Capture
1st Response Agency
Complete Hardcopy Form
Onboard Data Entry
GPS
Data Validation ???
Scan Report
Transcribe Hardcopy
Heads-Up/Validated Data Entry
Crash Report Image Archive
Crash Database

10. Field Data Entry

11. Data Collection: Scanning Reports/Validated Entry
1st Response Agency
Complete Hardcopy Form
Onboard Data Entry
GPS
Data Validation ???
Scan Report
Transcribe Hardcopy
Heads-Up/Validated Data Entry
Crash Report Image Archive
Crash Database

12. Heads-Up/Validated Data Entry

13. Data Collection: Scanning Reports/Validated Entry
1st Response Agency
Complete Hardcopy Form
Onboard Data Entry
GPS
Data Validation ???
Scan Report
Transcribe Hardcopy
Heads-Up/Validated Data Entry
Crash Report Image Archive
Crash Database

14. Data Collection: GIS Location
Crash Data Link
Exact Location
Roadway
Identifier
Crash
Database

15. Data Collection & Analysis For Improved Operations
Management
Merging State Data
Managing Related Data
Transitioning GIS Systems

16. Data Management: Merging State/Data
Pros
Reduces Data Entry Effort/$$
Standardized Database
Cons
Delay
Dependency
Local Data Collection
Enhanced State Data

17. Data Management: Managing Related Data
Traffic Signals

18. Data Management: Managing Related Data
Speed Limit

19. Data Management: Managing Related Data
Traffic Volume

20. Data Management: Managing Related Data
Number of Lanes

21. Data Management: Managing Related Data
Source/Maintained By
Data Collection/Data Entry
Sheriff's Office
Signs, Markings, Assets
Traffic Services Division – Asset Mngt. System
Traffic Volume (Annual Counts)
Planning and Growth Management
Traffic Volume (Study-Specific)
Traffic Services Division – Traffic Count DBase
Traffic Control/Geometrics
Traffic Services Division – Syncro/Asset Mgmt.
Demographic
US Census Department
Land Use
Aerial Imagery
Survey and Mapping/Property Appraiser
Photo Log
GIS Data
Information Services Department
Data Collection Sheriff’s Office
GIS Data Information Services Dept.

22. Data Management: Managing Related Data
Source/Maintained By
Data Collection/Data Entry
Sheriff's Office
Signs, Markings, Assets
Traffic Services Division – Asset Mngt. System
Traffic Volume (Annual Counts)
Planning and Growth Management
Traffic Volume (Study-Specific)
Traffic Services Division – Traffic Count DBase
Traffic Control/Geometrics
Traffic Services Division – Syncro/Asset Mngt.
Demographic
US Census Department
Land Use
Aerial Imagery
Survey and Mapping/Property Appraiser
Photo Log
GIS Data
Information Services Department
Do The Best You Can With What You’ve Got
Aerial Imagery Is a Great Substitute

23. Data Management: Transitioning GIS Systems
Node/Offset
XY Coordinate
Linear Reference

24. Data Management: Transitioning GIS Systems
Node/Offset
On Intersection of
Location Type Data
Distance & Direction From Intersection
Requires Post Processing to Map

25. Data Management: Transitioning GIS Systems
XY Coordinate
Uses GPS to Capture Exact Location
Requires Post Processing to Associate Other Data
Works Well With In-Vehicle Data Capture

26. Data Management: Transitioning GIS Systems
Linear Reference
Difficult to Assign in Field
Easy Association with Asset Data
Requires Post Processing to Group Crashes

27. Data Collection & Analysis For Improved Operations
Normalizing Data
Intersection Analysis
GIS Analysis

28. Analysis: Normalizing Data
What is an “Abnormal” Intersection?
State/Federal
Region/Jurisdiction
Region/Jurisdiction
Corridor/Area
Corridor/Area
Individual Location

29. Florida Highway Safety Matrix 2002
Hillsborough County
Total Fatalities and Injuries
Alcohol Related
Bicycle Fatalities and Injuries
Motorcycle Fatalities and Injuries
Pedestrian Fatalities and Injuries
Speed Related
Safety Equipment
Rank 2 1 4 7 4 5 3
Top Five In All Categories Except Motorcycle
Compared to Counties with Population Greater than 200,000

30. Crash Rates per 100 Million VMT

31. Injury Rates per 100 Million VMT

32. Fatality Rates per 100 Million VMT

33. Pedestrian Fatality Rates per 100,000 Population

34. Bicycle Fatality Rates per 100,000

35. Alcohol Related Fatality Rates per 100 Million VMT

36. Analysis: Normalizing Data
Distribution of Crashes By Age
State
County
Less Than 10%
County & Corridor Greater Than 25%
Corridor

37. Analysis: Normalizing Data
First Harmful Event (Rear End Crashes)
State
County
Corridor

38. Analysis: Normalizing Data
First Harmful Event (Rear End Crashes)
28%
42%
State
73%
Corridor
Intersection

39. Analysis: Intersection
Now that we know what’s expected,
what is extraordinary?

40. Intersection Analysis: Annual Trend
Year
Increase from 4 to 16

41. Intersection Analysis: Month Trend

42. Intersection Analysis: Daily Trend
Day of Week

43. Intersection Analysis: Hourly Trend
Hour of Day

44. Analysis: Intersection
Collision Diagram
Significant
Pattern

45. GIS Analysis: Identify Crash Patterns
Disregarded Traffic Signal
Apply

46. GIS Analysis: Identify Crash Patterns
Intersections With Red Light Running Crashes
Disregarded Traffic Signal

47. GIS Analysis: Review Specific Crashes
Crash ID#
Information About Specific Crash
Specific Crash
Arrow needed?

48. Hillsborough Ave./Bike-Ped Crashes
Bicycle
Pedestrian
Need aerial with crash info from Demian

49. GIS Analysis: Other Applications
Relate Asset/Traffic Operations Data
Relate Demographic Data
Automobile Ownership vs. Bike/Ped Crashes
Driver/Pedestrian Age
Relate to Land Use Data
Special Generators
School Safety
Bars/Nightclubs

50. Summary
Collection
Management
Analysis

51. Contacts/Resources ITE Web Site ITE Review and Comment
ITE Review and Comment
FHWA Office of Safety Website for Training and Education:

52. The End