Estimating Effectiveness of Safety Treatments in the Absence of Crash Data: A Guide
Crash
modification factors (CMFs) and functions are developed from historic crash data and help safety
professionals estimate the
expected safety impacts of specific roadway treatments. There has been a significant amount of research
to develop CMFs for common safety strategies and many are included in the American Association of
State and Highway Transportation Officials Highway Safety Manual and Federal Highway
Administration CMF Clearinghouse.
NCHRP Research Report 1069: Estimating Effectiveness of Safety Treatments in the Absence of Crash Data: A Guide,
from TRB's National Cooperative Highway Research Program,
presents a guide for using alternative, or surrogate, measures of safety for developing CMFs
and other quantifiable measures of safety performance.
Supplemental to the report is
NCHRP Web-Only Document 369: Estimating Effectiveness of Safety Treatments in the Absence of Crash Data and an
implementation memo.
This Summary Last Modified On: 10/2/2023