Which symbol indicates Single Tracking?

Single Tracking is represented by the symbol of two opposing arrows. This symbol visually conveys the concept that rail traffic is operating in both directions on the same track segment. The opposing arrows indicate that trains may encounter each other and need to carefully coordinate their movements to ensure safe operations while alternating their use of the track. Understanding this symbol is crucial for safely navigating areas where single tracking is implemented, as it signifies that standard operational protocols may be altered due to the shared use of the track.

The other options do not reflect the dual directionality of track usage inherent in single tracking. An upward arrow typically signifies a forward movement, while a single upward arrow may suggest a specific route or direction that is not indicative of the need to manage trains coming from two opposing directions.