Imagine you’re going to an Islanders game in Brooklyn. You’re walking down Flatbush Ave and reach Atlantic Ave. This is a big intersection with six lanes of heavy traffic and you have to cross it to reach Barclays Center.
You are running a bit late and you will probably miss the first two to three minutes of the game. The light is red at the moment and cars are whizzing by in front of you, but you can see that in just a few seconds, there will be a small gap until the next wave of traffic arrives.