What is the primary reason for following the taxi line onto the runway at night?

Following the taxi line onto the runway at night is primarily important for accurately aligning with the runway. Darkness can obscure visual references that are typically used during the day, making it harder to see exactly where the runway is located. The taxi line provides a clear and designated path which ensures that the aircraft is positioned properly for takeoff. This alignment is crucial not only for the safety of the takeoff but also for compliance with the runway's orientation. Accurate alignment helps minimize issues related to runway incursions and provides a more effective departure path.

Although other options may seem relevant under different contexts—such as avoiding other traffic being important in busy airport environments—none hold as much significance as accurate runway alignment when operating at night. Checking weather conditions is also critical, but this is typically done before the taxi phase.