Safety culture doesn't change because of a poster. It changes because people have something they can actually do. These are the field-tested frameworks I teach, built on real incidents and 23 years on the job.
AAA. Ask, Adapt, Act.
The habit that catches the assumption before it catches you.
ESCAPE
Plan for the emergency you hope never comes, before you need it.
Name It
You can't solve what you won't say out loud. Name the risk first.