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39TH INTERNATIONAL FORUM ON TRAFFIC RECORDS & HIGHWAY
INFORMATION SYSTEMS
D . B R E T T H A R R E L S O N , P E
S T A T E S A F E T Y E N G I N E E R
S C D O T
O C T O B E R 3 0 , 2 0 1 3
SCDOT Collision Diagram Tool
Background
South Carolina is 40th largest state
Average 100,000 crashes per year
Average 800-900 fatalities per year
SC has 4th largest state maintained roadway system
Over 41,000 miles of roadway
Approx 95 % of fatalities and 90% of all collisions
SC Safety Rankings – 2011
Mileage death rate – 3rd
Population death rate – 9th
DUI death rate – 1st
Motorcycle death Rate – 2nd
Bicycle death rate – 5th
Pedestrian death rate – 9th
Speed related death Rate – 2nd
Purpose
SCDOT produces approximately 300 diagrams per year
SCDOT wanted a way to automate the diagram process
Wanted a tool designed to work within SCDOT’s RIMS system
Create consistency
among diagrams
(among personnel)
Goals
SCDOT’s Goal was for the CD Tool to be used two ways:
1. As an on-demand tool for specific requests
2. As a support system in determining all safety concerns based on a statewide ranking
Faster way to complete diagrams
Software to mirror current diagram product
Create a “one stop shop” for generating a crash diagram
MicroStation Process
Labor intensive – approx. 1 hr to complete average size diagram
Requires staff to be proficient in MicroStation
MicroStation is a learned skill, not just computer knowledge
Uses multiple resources to combine geometry, roadway data and crash data
Requires hand tallies and calculations
MicroStation Process
Obstacles
Turning handwritten drawing into electronic data
Obstacles
Code and validation rules had to be designed to transform written report into symbols on diagram
Rules specific to SCDOT and SC’s crash form
Relies on the accuracy of the investigating officer Direction of Travel
Manner of Collision
Orientation of routes (N,S vs. E,W)
Challenge fitting all possible crash types on diagram
Complexity of Plotting a Crash
CD Tool relies on codes from the crash report
Complexity of Plotting a Crash
All crash types possible on x-type intersection diagram
264 Possible plotting locations
20 zones, 17 symbols
Complexity of Plotting a Crash
All crash types possible on section diagram
CD Tool Capabilities
CD Tool can generate diagrams from a standard query or from the state Rank table
CD Tool can generate diagrams for sections, X-type intersection and T-type intersections
Section length limited to 0.5 miles
Intersections limited to 4 legs
Standard Query Statewide Ranking
Generating a Collision Diagram
On-demand access
Network screening
CD Tool Interface
Four major components
Basic Information Tab
Crash Data Tab
Diagram Legend Tab
Diagram Archive Tab
Basic Information Tab
Automatically generated based on user’s query
Linked to roadway data tables
North arrow can be rotated
Crash Data Tab
• Automatically assigns a symbol and plotting zone based on crash details
• User can edit crash to plot in the correct spot or exclude the crash from the diagram
Hyperlinked Crash Reports
Editing Crash Data
Crash data can be edited to correct location and symbol or it can be excluded from diagram. Check box included to let other users know a crash has been reviewed and verified. Goal of user is to clear out the “Cannot Plot” section
Generating a Diagram
Once all crash data is edited/verified the user can generate a crash diagram from the “Crash Data” tab
Diagram file name is automatically generated to include route, local name, crossing milepoint and date – can also be edited by user
Linking to Crash Rankings
02-2012 CD
07-2012 CD
10-2013 CD
Completed Diagram – page 1
Completed Diagram page 2
Benefits of Automated CD Tool
Up to 50% time savings vs. drawing each location individually to site specific conditions using MicroStation
Diagrams are stored in a central location with all users having access to diagrams
The latest diagram is readily available
No human error when calculating rates, date range, etc.
Diagrams are completed with the latest roadway information (AADT, road names)
CD Tool only as good as crash data
Crash listed as “head on” in code
Future Enhancements
Add total number of crashes beside each symbol on finished collision diagram
Include turning lanes on diagram layout
Improved accuracy of plotted crashes with enhancements to the crash data
Questions
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