Which of the following is NOT a source of information for a learner when planning a route?

Emotional cues are not a reliable source of information for a learner when planning a route. While emotions can affect a person's perception and decision-making processes, they do not provide concrete data or physical characteristics of the environment that are essential for effective navigation.

In contrast, landmarks serve as identifiable points in the environment that can help orient individuals and provide reference points for navigation. Traffic sounds can indicate the presence and flow of vehicles, which is critical for understanding safe crossing points or determining the proximity of roadways. Textures and smells can also play a significant role in orientation; textures can indicate different surfaces such as grass, pavement, or gravel, while specific smells can inform a person about nearby locations, such as restaurants or bodies of water.

In summary, while emotional cues influence subjective experiences, they do not contribute practical navigational information like the other options listed.