Q: "Two people riding dirt bikes on a bike trail." Does this mean that "Two people met an accident on a bike trail."?
A: no

Q: "The white and black dog is on the grass." Does this mean that "There is a dog outside"?
A: yes

Q: "A green Animaniacs mug next to a man writing on a desk." Does this mean that "A man is writing and has a cup of coffee next to him."?
A: it is not possible to tell

Q: "A female street vendor is standing inside her kiosks which appears to sell a variety of foreign and handmade snacks." Does this mean that "A woman sells snacks on the street."?
A:
yes