Q: "A worker wearing a bright vest and black clothes is picking up trash on the ground while people cross the street behind him." Does this mean that "The man works for the city maintenance department."?
A: it is not possible to tell

Q: "Two people are racing a sidecar motorcycle in the mud." Does this mean that "There are two peple"?
A: yes

Q: "A black dog in the water" Does this mean that "A black dog is playing fetch in the water."?
A: it is not possible to tell

Q: "Two boys are playing in the water." Does this mean that "Two kids are in the water."?
A:
yes