How far in advance must a dispatcher message be requested when long time working limits are necessary?

When long time working limits are necessary, a dispatcher message must be requested a minimum of 14 hours in advance. This requirement is in place to ensure that all parties involved have ample time to prepare and make necessary arrangements for safety and efficiency. It allows for the proper coordination of train schedules and the management of resources, ensuring that there is minimal disruption to operations while maintaining safety protocols.

Requiring this advance notice helps in disseminating information to those affected by the working limits, allowing them to plan accordingly and mitigate any risk factors. Consequently, a 14-hour advance request strikes a balance between operational need and safety, making it the appropriate choice among the options provided.