Q: "crowd of people walking in the street" Does this mean that "And elderly couple is sitting on a bench in a park."?
A: no

Q: "Three children are riding tricycles on the path." Does this mean that "Children are riding the path."?
A: it is not possible to tell

Q: "A woman is painting a street rail." Does this mean that "A woman is painting a rail as part of an art project."?
A: it is not possible to tell

Q: "People walking in front of a billboard." Does this mean that "People are walking outdoors."?
A:
yes