Distant traffic noise is muffled by the movement of a person in the office.
A person is walking on the ground in the distance. A person opens a door with keys and they walk in and set the keys down. A person opens a door with keys, walks in and sets the keys down. Distant traffic noise is muffled by the movement of a person in the office. Distant traffic sounds are muffled by the movement of an individual in the office.