1. Center for Risk Management of Engineering Systems University of Virginia, Charlottesville 176 Alternative Database System HSIS (Highway Safety Information System) combined with GIS –Incorporates many databases such as crash inventory, roadway inventory, traffic signal inventory, and ADT –User interface allows data to be edited, analyzed, and exported –Supports graphical displays, point-and-click selections, pull-down and pop-up menus Crash analysis –Supports five searching methods –All methods allow user to designate variables to be reported

2. Center for Risk Management of Engineering Systems University of Virginia, Charlottesville 177 Crash Analysis Spot/Intersection Analysis –Evaluate accidents at a user designated spot or intersection Strip Analysis –Examine crashes along a designated length of roadway –User enters a route and length of segment –Program automatically searches consecutive strips

3. Center for Risk Management of Engineering Systems University of Virginia, Charlottesville 178 Crash Analysis (cont.) Cluster Analysis –Study accidents around a given roadway feature Sliding-Scale Analysis –Identify high accident roadway segments –Program memorizes all strips that exceed accident threshold Corridor Analysis –Locates high crash areas within a corridor

4. Center for Risk Management of Engineering Systems University of Virginia, Charlottesville 179 New Kent Case Study Initial Data Collection –Routes 609-622 Corridor Analysis –Corridors for which guardrail inventory is available –Routes 33, 106, 249, 273

5. Center for Risk Management of Engineering Systems University of Virginia, Charlottesville 180 Corridor Analysis Compare routes for frequency and severity of accidents Select routes that have greatest accidents/miles Compare results with current guardrail inventory Advantages –Reduce random chance associated with accidents –Use summary statistics available in HTRIS

6. Center for Risk Management of Engineering Systems University of Virginia, Charlottesville 181 Corridor Analysis (cont.) Disadvantages –Overlooks role of hazardous locations –Many locations of mediocre severity vs. one location of very high severity

7. Center for Risk Management of Engineering Systems University of Virginia, Charlottesville 182 Initial Analysis

8. Center for Risk Management of Engineering Systems University of Virginia, Charlottesville 183 Initial Analysis (cont.)

9. Center for Risk Management of Engineering Systems University of Virginia, Charlottesville 184 Initial Analysis (cont.)

10. Center for Risk Management of Engineering Systems University of Virginia, Charlottesville 185 Initial Analysis (cont.)

11. Center for Risk Management of Engineering Systems University of Virginia, Charlottesville 186 Initial Analysis (cont.) Route 249 (Using Total Accidents as measure) Route 106 (Using FO accidents/miles and FO accidents/DVMT as measure)

12. Center for Risk Management of Engineering Systems University of Virginia, Charlottesville 187 Initial Analysis (cont.) Route 273 (Using Total FO accidents as measure)

13. Center for Risk Management of Engineering Systems University of Virginia, Charlottesville 188 Future Work Conclude screening –Comprehensive corridor analysis Examine evaluation methods –Risk assessment and safety evaluation –Examine the safety state model Suggest Safety alternatives

14. Center for Risk Management of Engineering Systems University of Virginia, Charlottesville 189 Motivation Ability to compare multiple projects with a graphical user interface (GUI) –Assist resource allocation –Decision support –More evidence to the table, sooner –Demonstrate with New Kent County’s guardrails

15. Center for Risk Management of Engineering Systems University of Virginia, Charlottesville 190 Mission Statement Develop a GUI for a guardrail and hazard inventory system for resource allocation and decision making

16. Center for Risk Management of Engineering Systems University of Virginia, Charlottesville 191 Visualization of New Kent Graphically represent what resident engineers know using an electronic map indicating the locations of: –Guardrails –Obstacles –Accidents –Complaints, etc.

17. Center for Risk Management of Engineering Systems University of Virginia, Charlottesville 192 Electronic Map (Map 1)

18. Center for Risk Management of Engineering Systems University of Virginia, Charlottesville 193 Electronic Map Map of New Kent/route 249 area Similar to the zoomed in view on standard maps –Only concerned with guardrail sites, candidate sites, and accident data

19. Center for Risk Management of Engineering Systems University of Virginia, Charlottesville 194 Legend R, L, R*, L* –Side of road on which guardrail is located, * indicates substandard guardrail C1, C2, C3, Cn –C = citizen complaint –n = number of complaints

20. Center for Risk Management of Engineering Systems University of Virginia, Charlottesville 195 Legend (cont.) O –Obstacle A1, A2, A3, An –A = Accident –n = number of accidents

21. Center for Risk Management of Engineering Systems University of Virginia, Charlottesville 196 Legend Same functionality as the New Kent County map’s legend with different symbols –Guardrails –Obstructions –Complaints –Accidents

22. Center for Risk Management of Engineering Systems University of Virginia, Charlottesville 197 Integration of Map and Catalog The data visualized on the map comes from the catalog Users able to retrieve the data they want via the map

23. Center for Risk Management of Engineering Systems University of Virginia, Charlottesville 198 Example Functionality When a user selects a guardrail site, the information in the catalog about that site is displayed –Location, type, direction, length, etc. When a user selects a route, that information is displayed –Guardrail prevalence, ADT, accidents, etc.

24. Center for Risk Management of Engineering Systems University of Virginia, Charlottesville 199 Zoomed In (Map 2)

25. Center for Risk Management of Engineering Systems University of Virginia, Charlottesville 200 Zoomed In (Map 3)