Objects in the image:
category: person
category: traffic light
category: car
category: person
category: traffic light
category: person
category: car
category: truck
category: traffic light
category: traffic light
category: truck
category: person
category: car
category: car
category: traffic light
category: person
category: car
category: car
category: car
category: car

Guessing-game dialogue about one of the objects:
q: is a person?
a: No
q: is a car?
a: N/A
q: is a signboard?
a: No
q: is a vehicle?
a: Yes
q: in the left half of the image?
a: No
q: the big vehicle with 2 red lights?
a: Yes