AASHTO American Association of State Highway Transportation Officials

CMF Crash Modification Factors

DOT State Department of Transportation (a general term used to describe the state agency that is responsible for the design and maintenance of the state transportation highway network)

FHWA Federal Highway Administration

HCM Highway Capacity Manual

HSIP Highway Safety Improvement Program

HSM Highway Safety Manual

IHSDM Interactive Highway Safety Design Model

ITE Institute of Transportation Engineers

NCHRP National Cooperative Highway Research Program

NHI National Highway Institute

RSAP Roadside Safety Analysis Program

SPF Safety Performance Functions

SPR State Planning and Research

TRB Transportation Research Board

VPD Vehicles per Day