The four pillars are safety management policy, safety risk management, safety assurance, and safety promotion. Safety management policy establishes leadership commitment, roles, and accountabilities. Safety risk management identifies hazards and analyzes the risks they pose.

Safety assurance monitors whether controls are working as intended through data collection, audits, and performance metrics. Safety promotion builds a culture of safety through training, communication, and employee reporting systems. Together the four pillars create a continuous cycle, where policy enables risk management, assurance validates that risk controls work, and promotion reinforces the behaviors that make the whole system function.

The Accountable Executive is the single person with ultimate responsibility for carrying out the Agency Safety Plan and the Transit Asset Management plan, with control or direction over the resources needed to do so. Under 49 CFR Part 673, this person must be clearly identified in the plan.

Per FTA guidance, a contractor employee can serve as the Accountable Executive when the transit system is managed and operated by a contractor, as long as the individual meets the regulatory requirements for the role. The same applies to the Chief Safety Officer, who can be a contractor employee provided they report directly to the agency’s chief executive and meet the training and independence requirements in the rule.

Small public transportation providers, generally those with 100 or fewer vehicles in peak service and no rail operations, can have their Agency Safety Plan developed by their state DOT on their behalf. They can also choose to develop their own plan if they prefer.

FTA publishes template ASPs and sample documents specifically designed for small providers. States that develop plans for small operators must certify compliance through the Transit Award Management System. Either way, the plan must be reviewed and self-certified annually to keep federal funding flowing.

FTA published updates to the PTASP regulation on April 9, 2024, incorporating requirements from the Infrastructure Investment and Jobs Act. The updates strengthen SMS processes, add explicit requirements to address assaults on transit workers, transit vehicle-pedestrian collisions, and infectious disease exposure, and clarify several existing provisions.

Agencies need to update their Agency Safety Plans to reflect the new requirements, which often means adding new risk mitigations, revising safety performance targets, and expanding employee reporting processes. The smoothest transitions happen when agencies use the update as an opportunity to strengthen SMS rather than treating it as a pure documentation exercise.

System Safety Program Plans, or SSPPs, were the older compliance-focused documents required under previous FTA regulations. They emphasized having written procedures and checking that rules were followed, with less focus on identifying and proactively managing risk.

Agency Safety Plans under the current PTASP rule require full SMS implementation, with formal hazard identification, safety risk assessment, safety assurance, and safety promotion processes. The shift is from documenting what the agency does to demonstrating that safety risk is actively managed with data and leadership attention. Agencies that treat ASPs as renamed SSPPs typically struggle with their next audit.