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A Guide to Applying the Safe System Approach to Transportation Planning, Design, and Operations (2025)

Chapter: Acronyms and Abbreviations

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Suggested Citation:"Acronyms and Abbreviations." 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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Acronyms and Abbreviations

AACN advanced automatic crash notification
ACN automatic crash notification
ALR/ALS administrative license revocation or suspension
BAC blood alcohol concentration
CD crash diagnoses
CMF crash modification factor
DOT department of transportation
DUI driving under the influence
EMS emergency medical services
EMT emergency medical technician
IRA injury risk assessment
ISA intelligent speed assist
ITS intelligent transportation systems
km/h kilometers per hour
LOS level of service
mph miles per hour
NCAP New Car Assessment Program
NG911 Next Generation 911
NSC National Safety Council
PCC professional and community coordination
PERF Police Executive Research Forum
SD standard deviation
STEER Strengthening Traffic Enforcement, Education, and Responsibility
VMT vehicle miles traveled
VSL variable speed limits
WHO World Health Organization
Page 65
Suggested Citation:"Acronyms and Abbreviations." 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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Page 65
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A Guide to Applying the Safe System Approach to Transportation Planning, Design, and Operations
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The Safe System approach is a holistic approach that provides a framework for making the U.S. national transportation system safer. It is based on building and reinforcing multiple layers of protection to prevent crashes from happening and minimize the harm caused when crashes occur. This safety approach differs from conventional ones because it focuses on human vulnerability and creates a system with many redundancies to protect all transportation users.

NCHRP Research Report 1135: A Guide to Applying the Safe System Approach to Transportation Planning, Design, and Operations, from TRB's National Cooperative Highway Research Program, presents information for applying the Safe System approach among state departments of transportation and other transportation agencies.

Supplemental to the report is NCHRP Web-Only Document 413: Applying the Safe System Approach to Transportation Planning, Design, and Operations.

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