1. Midwestern District ITE 2017 Conference
Safety Screening Analysis Geometric Deficiency and Crash Map Automation
Glenn Vorhes, PE, GISP
Midwestern District ITE 2017 Conference
June 19, 2017

2. Introduction Project Goals, Definition
Develop an application with which users can quickly and easily identify and map the most dangerous segments of highway
Self Service and easy, Limited or no special training
Ready access to data brought together from multiple sources
Geometric Deficiencies / Controlling Criteria
Design Speed
Lane Width
Shoulder Width
Horizontal Curve Radius
Superelevation
Maximum Grade
Stopping Sight Distance
Cross Slope
Vertical Clearance
Design Loading Structural Capacity
Safety Problem Flags (Crashes/100 million VMT)
Crash Rate: All crashes
KAB Crash Rate: Fatalities, Incapacitating Injury, Non-incapacitating Injury
Still subject to review for a Programmatic Exception to Standards

3. Status Quo Ante Manually Created Maps
Involved lookups to a variety of (inaccessible) data sources
Not readily reproducible, Stored in “silos”

4. WisDOT STN Wisconsin Department of Transportation State Trunk Network
Interstates
US Highways
State Highways
Pioneer of Linear Referencing System
Position in terms of Reference Points or Route, Link and Offset
Roadway features and operations information is tied to this

5. MetaManager WisDOT data product Updated 3 times a year
~20,000 segments with a typical length of ¾ mile, covers 15K miles
Over 200 attributes per segment
Selected Tables
Base – Segment start/end reference points, highway, direction
Roadway – AADT, Roadway Attributes, Curve, No-passing zones
Pavement – Current and projected pavement conditions
Safety – Crash Counts, Accident Flags (last 5 years)
Mobility – Level of service, deficiencies, suggested Improvements
Bridge – Attributes, current and projected conditions,
Spatially enabled dataset derived from the STN, lookup table for backward reference to all data tied to the STN

6. MetaManager Applications
Has many applications beyond SSA
Intelligent Transportation Systems (ITS) Needs Analysis Tool

7. Crash Database WisTransportal – Many Services, Applications
1994 to present
Crash attributes
Location
Vehicles Involved
Severity
Road Conditions
Purposes
Service to WisDOT, law enforcement
Valuable for research

8. Photolog Precise XYZ location at 1/100th mile intervals
Used for curve identification and visibility analysis

9. Project Diagram

10. Architecture
Database
Server
Client/Browser

11. Project Extent
Definition of a project by the selection of start and end segments for one or more corridors
Point-Click interface with informative popups
Project create or modification triggers queries against available data

12. Worksheet Download
Initially planned to implement deficiency identification logic within the application
Difficult but not insurmountable, Logic a moving target
Plan B was to pre-populate an Excel file with available information
Macros, user entry of other/local information

13. Deficiency Identification
Deficiencies themselves identified by means of the Excel workbook
Segments identified as deficient are marked as such in the web application for mapping purposes
Excel workbook and map become complementary; Worksheet serves as a legend for the map; problem segments are identified by unique ID

14. Map output

15. Map output with Crash Points

16. Break For Demo

17. Thank you for coming! Questions? Conclusion “Significant” time savings
Safety Screening Analysis a required component planning
Map and report must be present in Design Study Report
Central storage and distribution center
As an interactive web map, provides more (organized) information than is feasible on a static map
Thank you for coming!
Questions?