Controller of Site Safety (COSS) Practice Exam 2026 – The Complete All-in-One Guide to Exam Success!

When working on or near an active track within a line blockage, you must have protection that matches the level of risk created by the task. A hand trolley being operated on the rail inside a line blockage still presents a potential hazard from any approaching train and from personnel and equipment on the track. That higher level of risk requires the most protective option available for line-block operations, which is Additional Protection. This level provides extra safeguards beyond basic or standard protection—such as enhanced access control, additional lookouts, and stricter controls to ensure the environment remains safe for the on-track activity.

Standard Protection or Basic Protection would not cover the extra precautions needed for moving a hand trolley on the track within a blockage, and No Protection is not permissible since any on-track work in a line blockage requires protection.