{
    "objects": [
        {
            "name": "vehicle_1",
            "type": "car",
            "bounding_box_top_down": [
                [
                    375,
                    250
                ],
                [
                    475,
                    250
                ],
                [
                    485,
                    370
                ],
                [
                    365,
                    370
                ]
            ],
            "attributes": {
                "color": "gray"
            }
        },
        {
            "name": "vehicle_2",
            "type": "car",
            "bounding_box_top_down": [
                [
                    640,
                    210
                ],
                [
                    835,
                    210
                ],
                [
                    850,
                    330
                ],
                [
                    620,
                    330
                ]
            ],
            "attributes": {
                "color": "blue"
            }
        },
        {
            "name": "traffic_light_group_1",
            "type": "traffic_lights",
            "bounding_box_top_down": [
                [
                    470,
                    120
                ],
                [
                    520,
                    120
                ],
                [
                    520,
                    170
                ],
                [
                    470,
                    170
                ]
            ],
            "attributes": {
                "signal_state": "green_visible"
            }
        },
        {
            "name": "traffic_light_group_2",
            "type": "traffic_lights",
            "bounding_box_top_down": [
                [
                    560,
                    120
                ],
                [
                    610,
                    120
                ],
                [
                    610,
                    170
                ],
                [
                    560,
                    170
                ]
            ],
            "attributes": {
                "signal_state": "green_visible"
            }
        }
    ],
    "regions": [
        {
            "name": "roadway_1",
            "type": "road",
            "polygon_top_down": [
                [
                    0,
                    360
                ],
                [
                    1024,
                    360
                ],
                [
                    1024,
                    768
                ],
                [
                    0,
                    768
                ]
            ]
        },
        {
            "name": "left_lane_1",
            "type": "lane",
            "polygon_top_down": [
                [
                    0,
                    420
                ],
                [
                    320,
                    420
                ],
                [
                    310,
                    760
                ],
                [
                    0,
                    760
                ]
            ]
        },
        {
            "name": "right_lane_1",
            "type": "lane",
            "polygon_top_down": [
                [
                    320,
                    420
                ],
                [
                    1024,
                    420
                ],
                [
                    1024,
                    760
                ],
                [
                    310,
                    760
                ]
            ]
        },
        {
            "name": "shoulder_1",
            "type": "roadside",
            "polygon_top_down": [
                [
                    1020,
                    420
                ],
                [
                    1024,
                    760
                ],
                [
                    820,
                    760
                ],
                [
                    860,
                    420
                ]
            ]
        },
        {
            "name": "crosswalk_area_1",
            "type": "crosswalk",
            "polygon_top_down": [
                [
                    455,
                    660
                ],
                [
                    575,
                    660
                ],
                [
                    585,
                    710
                ],
                [
                    445,
                    710
                ]
            ]
        },
        {
            "name": "intersection_ahead_1",
            "type": "intersection",
            "polygon_top_down": [
                [
                    380,
                    170
                ],
                [
                    720,
                    170
                ],
                [
                    790,
                    360
                ],
                [
                    310,
                    360
                ]
            ]
        }
    ],
    "semantic_relationships": [
        {
            "subject": "vehicle_1",
            "relation": "is_in_lane",
            "object": "right_lane_1"
        },
        {
            "subject": "vehicle_2",
            "relation": "is_in_lane",
            "object": "shoulder_1"
        },
        {
            "subject": "vehicle_1",
            "relation": "is_on",
            "object": "roadway_1"
        },
        {
            "subject": "traffic_light_group_1",
            "relation": "controls",
            "object": "intersection_ahead_1"
        },
        {
            "subject": "traffic_light_group_2",
            "relation": "controls",
            "object": "intersection_ahead_1"
        },
        {
            "subject": "intersection_ahead_1",
            "relation": "includes_area",
            "object": "crosswalk_area_1"
        },
        {
            "subject": "roadway_1",
            "relation": "has_lane",
            "object": "left_lane_1"
        },
        {
            "subject": "roadway_1",
            "relation": "has_lane",
            "object": "right_lane_1"
        }
    ],
    "current_location": {
        "region": "roadway_1",
        "note": "Camera vehicle is on the roadway approaching the intersection."
    }
}