The context of the following conversation is Riley and Alex were having a race, Alex was right behind Riley but just couldnt get past them so ended up losing the race.:
Alex says I lost a race to Riley today.
The friend responds What happened? You're pretty fast..
Alex responds We were racing down city streets. And I couldn't get around him because people were walking in the other lane..
The friend responds Where you in the street, or on the sidewalk?.
Alex responds On the sidewalk. And I was right behind him..
The friend responds Yeah pedestrian traffic is pretty heavy in your neighbourhood..