Security Risk Assessment Methodology for Public Transit


This standard proposes a methodology for determining security risk in public transportation systems.

Document History
Document Number Version Publication Date Publication Related Information
APTA SS-SIS-S-017-21 03/23/2021 Published Current


assessment, consequence, mitigation, risk, risk tolerance, security, severity, threat, transit security, vulnerability


This document provides a methodology to assess security risks for public transportation systems. It defines the elements of a Security Risk Assessment to include threat, vulnerability, likelihood, and consequence. Using this methodology to assess security risk provides transit agencies a sound process to determine risk and develop mitigation measures or controls to improve their risk profile.

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