Final answer:
The line indicates that the scene is to be shot outside during the day on a busy downtown street corner, setting the stage for the action and dialogue that follow.
Step-by-step explanation:
The line "EXT (exterior) daytime, busy downtown street corner" from a traditional screenplay indicates the setting of the scene. It means that the shot is taken outside (exterior) during the day, on a busy downtown street corner. This notation helps the production crew understand where the scene is situated and what time of day it should appear to be in the film or show. Importantly, it sets the stage for the action that is to unfold, but it doesn't inherently indicate any specific action like dramatic tension or a fight between characters. Instead, it provides a backdrop that helps to contextualize the subsequent dialogue and action.