What is the correct whistle signal for running against traffic?

The correct whistle signal for running against traffic is one long, followed by one short. This signal is universally used to indicate to others that a person is traveling in the opposite direction of the typical flow of traffic. The long whistle serves as a clear alert that the runner is present and moving against the expected direction. This is important for safety, as it allows vehicles and other pedestrians to be aware of the runner’s presence, thereby reducing the chances of accidents.

In contrast, other signals have different meanings and are not appropriate for indicating running against traffic. The combinations of short and long whistles in other configurations serve alternative purposes, such as signaling for attention in different contexts. Understanding these signals and their meanings is crucial for maintaining safety on the roads and pathways.