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Accessing and Using Roadway and Crash Data
Tom Casson
Menard County Engineer/IACE
and
Doug Keirn
IDOT - District 9
Programming Engineer
Roadway Data
Roadway Data Collection
• State Road System – Input from Plans
• Local Road System – From Plans and Inventoried every 5 Years
• Structure Data – When Bridge is Opened, Construction Contract is Let, and After Inspections
Roadway Data Sources• IRIS Roadway Database from IDOT
• ISIS Structure Database from IDOT
• Filter/Query Data Field Examples• Outside Shoulder Width/Type (2 Fields)• Number of Lanes/Lane Width• Traffic Volumes(ADT & Truck)• Maintenance/Jurisdiction• Functional Classification• Surface Type/Year/CRS• Speed Limit• NHS Route
Manual Describing Structure Data
Manual Describing Railroad Data
Manual Describing Roadway Data
http://apps.dot.illinois.gov/gist2/
Sources for Viewing Data
•ESRI ArcMap GIS Software
•ESRI GIS Online
•Google Earth/Maps
•Open Source GIS Software
ESRI ArcMap
GIS Online
•Public Account
•Minimal Features
•Allows Viewing and Filtering IDOT Shapefiles
Google Earth
Roadway Layer
Structure Layer
Open Source - QGIS
GETTING AROUND ILLINOIS
Crash Data
Crash Summary Report
5% Locations
SAFETY PORTAL