Final Answer:
Shannon, upset after an argument with her parents, immerses herself in music to escape, finding solace in its rhythm until reality intrudes, making her frustrations evident at a pedestrian crossing.
Step-by-step explanation:
Shannon, seeking refuge from parental disagreements, finds solace in music's rhythm, reminiscent of her childhood fascination with trains as symbols of freedom, allowing her to momentarily escape. As she walks, the music syncs with passing trains, creating a blend of melodies that transports her away from familial discord.
However, a sudden change in the song's tempo snaps her back to reality, making her aware of her surroundings at a crosswalk, where her frustration boils over. In a fit of anger, she yells at the red light, expressing her impatience and emotional turmoil, using the metaphor of standing for "three days" to emphasize her pent-up feelings of waiting for resolution.
Shannon's outburst signifies her desire for control and immediate resolution in a situation where she feels unheard or disregarded, echoing her frustration from the unresolved argument with her parents.