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Suggested Citation:"Appendix F: Safe System Post-Crash Response Practices." National Academies of Sciences, Engineering, and Medicine. 2025. A Guide to Applying the Safe System Approach to Transportation Planning, Design, and Operations. Washington, DC: The National Academies Press. doi: 10.17226/29147.
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APPENDIX F
Safe System Post-Crash Response Practices
Appendix F provides data on how respondents appraised various Safe System post-crash response practices. See Table F-1 for scores related to each practice’s feasibility and impact.
Interpretive categorization of Z-scores (Feasibility and Impact columns), with a mean of zero (0) and standard deviation of one (1).
| Categories | Z-scores |
|---|---|
| High | > 1 SD above mean |
| Moderate | < 1 and > 0 |
| Low | > −1 and < 0 |
| Very Low | < −1 SD below mean |
Note: SD = standard deviation round the mean score of zero (0).
Page 84
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Suggested Citation:"Appendix F: Safe System Post-Crash Response Practices." National Academies of Sciences, Engineering, and Medicine. 2025. A Guide to Applying the Safe System Approach to Transportation Planning, Design, and Operations. Washington, DC: The National Academies Press. doi: 10.17226/29147.
×
Table F-1. Post-Crash Response practice feasibility and impact scores (n = 66).
| Practice | Feasibility | Impact | Category |
|---|---|---|---|
| Forming a task force or community coalition of law enforcement, transportation, public health, members of the community, and other partners to investigate serious crashes and report findings and proposed changes to the public. | 0.418 | 0.300 | Moderate Feasibility/Moderate Impact |
| Training law enforcement and transportation staff to coordinate post-crash reporting at crash sites. | 0.332 | 0.153 | Moderate Feasibility/Moderate Impact |
| Developing joint action plans with emergency services partners to integrate operational planning with emergency services planning. | 0.328 | −0.145 | Moderate Feasibility/Low Impact |
| Linking police with emergency medical services/hospital data for persons injured in motor vehicle crashes. | −0.038 | 0.208 | Low Feasibility/Moderate Impact |
| Upgrading analog 911 infrastructure to Next Generation 911 (commonly referred to as NG911) to create a faster, more resilient system that facilitates public reporting to the 911 network. | −0.073 | 0.242 | Low Feasibility/Moderate Impact |
| Placing serious crashes in a time- or place-based context when engaging news media partners. | 0.473 | −0.369 | Moderate Feasibility/Low Impact |
| Establishing a traffic incident management system that documents roadway and incident clearance times, as well as secondary crashes. | −0.033 | −0.085 | Low Feasibility/Low Impact |
| Instituting automatic crash notification for vehicle collisions with people walking, cycling, or rolling. | −0.452 | 0.312 | Low Feasibility/Moderate Impact |
| Installing automatic collision notification systems on more remote, rural roadways. | −0.335 | 0.137 | Low Feasibility/Moderate Impact |
| Encouraging and facilitating public use of self-reporting (via mobile app or survey) to capture collisions and other events falling outside the scope of traditional crash reporting (e.g., near misses, pedestrian and bicyclist falls). | −0.080 | −0.566 | Low Feasibility/Low Impact |
| Deploying unmanned aerial systems to conduct route monitoring, crash incident verification, secondary crash detection, and response vehicle routing to and from the crash site. | −0.540 | −0.187 | Low Feasibility/Low Impact |
Page 83
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Suggested Citation:"Appendix F: Safe System Post-Crash Response Practices." National Academies of Sciences, Engineering, and Medicine. 2025. A Guide to Applying the Safe System Approach to Transportation Planning, Design, and Operations. Washington, DC: The National Academies Press. doi: 10.17226/29147.
×
Page 84
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Suggested Citation:"Appendix F: Safe System Post-Crash Response Practices." National Academies of Sciences, Engineering, and Medicine. 2025. A Guide to Applying the Safe System Approach to Transportation Planning, Design, and Operations. Washington, DC: The National Academies Press. doi: 10.17226/29147.
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