How should crews respond to ambiguous signals according to NORAC rules?

Crews should stop and treat an ambiguous signal as a stop signal to ensure safety and prevent potential accidents. NORAC rules prioritize safety above all else, and when a signal is unclear or can be interpreted in multiple ways, the prudent response is to halt the train's progress. This ensures that a crew can adequately assess the situation, avoid misinterpretation of the signal, and take necessary actions based on the context or obtain further clarity from signalmen or controllers. This approach minimizes risk and promotes safe operational practices on the railway. By stopping, the crew can then follow up with appropriate measures, such as seeking clarification or waiting for additional instructions, ensuring that they only proceed when they have clear and definitive signals to act upon.