At-risk behaviour is where we unintentionally drift away from good choices, values-based choices and safer choices. This may be one person's choice but is often following the behavioural norm of the workgroup or others.
Examples include jaywalking, arriving for work late or leaving early, or using the office printer to do some copying for home. It could be that the risk is considered insignificant or maybe there is a lack of situational awareness.
This is where your supervisors and front-line managers have the biggest role to play. If properly trained they can identify at-risk behaviours in their team (and themselves) and take action to deal with poor behavioural norms. They can "call out" poor behaviours and incentivise good ones.
It is important that senior managers are also conscious of their behaviours. They should actively and visibly demonstrate values based and safer choices. Many poor behavioural norms are not limited to front-line workers.