This is to practice keeping track of intersections while in a distracting environment. Ideally you practice this skill outside instead, so treat this as a tool to use when you do not have a better option.
Press start, track what intersection you're at (in the top right corner), and find yourself a long YouTube video to watch. Every once in a while you'll get a new intersection, shown once the background image changes and a new sign in the top-right corner appears. After a certain amount of minutes, you'll be tested on what your last intersection was.