Multiple people , one of whom is on a bicycle , cross a busy street .
The people are crossing the street .
Multiple people, one of whom is on a bicycle, cross a busy street.
The people are crossing the street.
If people cross a specific type of street, e.g. busy, then they are crossing a street in general.
If people cross a specific type of street , e.g . busy , then they are crossing a street in general .