Creating and Using an Intersection Inventory Sharing the WYDOT Experience

WYDOT's Intersection Inventory - Joe McCarthy, JDI Consulting My Main Points An Intersection Inventory is a valuable safety asset Creating one is challenging, but worth it The time is right to pursue WYDOT's Intersection Inventory - Joe McCarthy, JDI Consulting

The “Intersection Equation” + ≠ − WYDOT's Intersection Inventory - Joe McCarthy, JDI Consulting

An Intersection Inventory - Is… A defined database structure List of intersections And their attributes Related legs Linkable By geo-location, unique ID With crash data WYDOT's Intersection Inventory - Joe McCarthy, JDI Consulting

An Intersection Inventory – Why? Consolidates useful data Can assign crashes Facilitates Analysis Selecting the intersection (crashes) HSM Predictive modeling Relative ranking Comparison with “like” intersections Enables associated tools WYDOT's Intersection Inventory - Joe McCarthy, JDI Consulting

Exponential References I 25 Business US 85 South Greeley Highway I 25 Business WY 212 W College Dr WY 212 E College Dr US 85 South Greeley Highway WYDOT's Intersection Inventory - Joe McCarthy, JDI Consulting

Creating an Intersection Inventory – How? Define data model Populate the list Add in the attributes Handling the gotcha’s WYDOT's Intersection Inventory - Joe McCarthy, JDI Consulting

LRS Processing – Before WYDOT's Intersection Inventory - Joe McCarthy, JDI Consulting

WYDOT's Intersection Inventory - Joe McCarthy, JDI Consulting LRS Processing - After WYDOT's Intersection Inventory - Joe McCarthy, JDI Consulting

Handling Special Cases WYDOT's Intersection Inventory - Joe McCarthy, JDI Consulting

WYDOT's Intersection Inventory - Joe McCarthy, JDI Consulting Even More Complicated WYDOT's Intersection Inventory - Joe McCarthy, JDI Consulting

Introducing Our Intersection Located in Casper Major Route WY 258 / WYOMING BLVD Direction: N/S Highway Minor Route E 2ND ST Direction: E/W Signalized: Yes Number of legs: 4 WYDOT's Intersection Inventory - Joe McCarthy, JDI Consulting

Intersection Inventory – In Use Categorize (“like” intersections) Assign crashes Analyze View/Edit Report WYDOT's Intersection Inventory - Joe McCarthy, JDI Consulting

WYDOT's Intersection Inventory - Joe McCarthy, JDI Consulting Assign Crashes Simple algorithm: If within 250 feet of the intersection, then assign to the nearest intersection. (500 feet on major route of a rural intersection) WYDOT's Intersection Inventory - Joe McCarthy, JDI Consulting

Analyze – Relative Ranking Signalized 4-leg On-System WYDOT's Intersection Inventory - Joe McCarthy, JDI Consulting

WYDOT's Intersection Inventory - Joe McCarthy, JDI Consulting Analyze – Top Level WYDOT's Intersection Inventory - Joe McCarthy, JDI Consulting

Analyze – Types of Crashes WYDOT's Intersection Inventory - Joe McCarthy, JDI Consulting

Analyze – Data Presentation Intersection Collision Diagram A graphical representation of the crash types that on each leg (by quadrant). Does not indicate location. South- bound West- bound East- bound North- bound WYDOT's Intersection Inventory - Joe McCarthy, JDI Consulting

Analyze – Crash Locations Showing the location (as entered by the officer) of each crash assigned to the intersection. Color indicates injury severity WYDOT's Intersection Inventory - Joe McCarthy, JDI Consulting

View/Edit the Intersection Data WYDOT's Intersection Inventory - Joe McCarthy, JDI Consulting

And the Intersection Legs… WYDOT's Intersection Inventory - Joe McCarthy, JDI Consulting

Intersection Inventory – The Time is Right! ARNOLD GIS capability Progress on Segments WYDOT's Intersection Inventory - Joe McCarthy, JDI Consulting

Questions? For off-line follow up, feel free to contact Matt.Carlson@wyo.gov – State HW Safety Engineer Joe.McCarthy@wyo.gov – Consultant to WYDOT

WYDOT's Intersection Inventory - Joe McCarthy, JDI Consulting Take-Away Points An Intersection Inventory is a valuable safety asset Creating one is challenging, but worth it The time is right to pursue WYDOT's Intersection Inventory - Joe McCarthy, JDI Consulting

Backup Slides

Maintaining the Intersection Inventory Periodic processing of the LRS Flag changes (new/modified/removed) Updating attributes Populating additional attributes WYDOT's Intersection Inventory - Joe McCarthy, JDI Consulting

MIRE FDE (non-local paved) Unique Junction Identifier (120). Location Identifier for Road 1 Crossing Point (122). Location Identifier for Road 2 Crossing Point (123). Intersection/Junction Geometry (126). Intersection/Junction Traffic Control (131). AADT (79) for Each Intersecting Road AADT Year (80) WYDOT's Intersection Inventory - Joe McCarthy, JDI Consulting

Attributes - Intersection INTERSECTION_ID AREA_TYPE_CODE CITY_ID COUNTY_ID FACILITY_TYPE GEOMETRY INTERSECTION_LIGHTING_ID INTERSECTION_NAMES INTERSECTION_ROUTES JUNCTION_GEOMETRY_TYPE_ID JUNCTION_NUMBER_OF_LEGS JUNCTION_OFFSET_TYPE JUNCTION_TRAFFIC_CONTROL JUNCTION_TYPE_ID MAJOR_ROUTE_DIRECTION MAJOR_ROUTE_ID MAJOR_ROUTE_NAME MAJOR_ROUTE_RM MINOR_ROUTE_DIRECTION MINOR_ROUTE_ID MINOR_ROUTE_NAME MINOR_ROUTE_RM RELATED_INTERCHANGE ACTIVE WYDOT's Intersection Inventory - Joe McCarthy, JDI Consulting

WYDOT's Intersection Inventory - Joe McCarthy, JDI Consulting Attributes - Legs INTERSECTION_ID INTERSECTION_LEG_ID ROUTE_ID ROUTE_NAME FROM_RM TO_RM LEG_AZIMUTH LEG_DIRECTION TWOWAY_VS_ONEWAY AADT AADT_YR LEG_WIDTH ENTERING_SIGHT_DISTANCE_L ENTERING_SIGHT_DISTANCE_R ACCELERATION_LANE_LENGTH LTURN_OFFSET LTURN_OFFSET_DISTANCE LTURN_OFFSET_TYPE LTURN_PHASING MEDIAN MEDIAN_EXISTS NUMBER_ENTERING_LANES NUMBER_LEFT_TURN_LANES NUMBER_RIGHT_TURN_LANES NUMBER_THROUGH_LANES RIGHT_TURN_CHANNELIZATION SAFETY_FEATURE_OPTIONS SPEED_LIMIT TRAFFIC_CONTROL TURN_PROHIBITIONS TYPE_OF_DETECTION WYDOT's Intersection Inventory - Joe McCarthy, JDI Consulting

Analysis – Direction of Force WYDOT's Intersection Inventory - Joe McCarthy, JDI Consulting