Network Rule NWT 308 Absolute Signal Blocking will change effective Sunday 24 March 2019. As a result, there will be corresponding updates to the CSS script used by Protection Officers and qualified workers implementing worksite protection in the rail corridor. The updates include additional questions to ensure the nominated worksite is within the limits of an authority, that multiple worksites are not involved, and that potential entry from intermediate sidings is secured. A Worksite Protection Mentor will provide assistance regarding the changes from 25 March to 7 April.