Which of the following is a common fixed post duty?

Controlling access is indeed a common fixed post duty for security personnel. This responsibility involves monitoring who enters and exits a facility, ensuring that only authorized individuals gain entry, and checking for identification or credentials as necessary. It helps maintain security and safety within the premises and is crucial in preventing unauthorized access, which could lead to theft, vandalism, or other security threats.

In contrast, while identifying safety violations, patrolling in a vehicle, and approaching trespassers are important aspects of security work, they are typically not associated with fixed post duties. Identifying safety violations might be more relevant in a patrol or inspection role rather than a static location. Patrolling in a vehicle implies a mobile duty, and approaching trespassers usually involves a more dynamic response to immediate situations rather than a fixed role. Therefore, the focus on controlling access explicitly aligns with the nature of fixed post responsibilities in security operations.