{
    "objects": [
        {
            "name": "vehicle_1",
            "category": "vehicle",
            "bbox_top_down": {
                "x": 390,
                "y": 410
            },
            "attributes": {
                "type": "car",
                "headlights": "on"
            }
        },
        {
            "name": "vehicle_2",
            "category": "vehicle",
            "bbox_top_down": {
                "x": 330,
                "y": 455
            },
            "attributes": {
                "type": "car",
                "taillights": "on"
            }
        },
        {
            "name": "vehicle_3",
            "category": "vehicle",
            "bbox_top_down": {
                "x": 470,
                "y": 520
            },
            "attributes": {
                "type": "car",
                "taillights": "on"
            }
        },
        {
            "name": "streetlight_1",
            "category": "infrastructure",
            "bbox_top_down": {
                "x": 520,
                "y": 170
            },
            "attributes": {
                "mounted": "overhead"
            }
        },
        {
            "name": "streetlight_2",
            "category": "infrastructure",
            "bbox_top_down": {
                "x": 120,
                "y": 260
            },
            "attributes": {
                "mounted": "overhead"
            }
        }
    ],
    "regions": [
        {
            "name": "roadway",
            "category": "road",
            "polygon_top_down": [
                {
                    "x": 40,
                    "y": 350
                },
                {
                    "x": 600,
                    "y": 350
                },
                {
                    "x": 620,
                    "y": 560
                },
                {
                    "x": 20,
                    "y": 560
                }
            ]
        },
        {
            "name": "right_lane",
            "category": "road_lane",
            "polygon_top_down": [
                {
                    "x": 380,
                    "y": 375
                },
                {
                    "x": 620,
                    "y": 375
                },
                {
                    "x": 610,
                    "y": 560
                },
                {
                    "x": 370,
                    "y": 560
                }
            ]
        },
        {
            "name": "left_lane",
            "category": "road_lane",
            "polygon_top_down": [
                {
                    "x": 40,
                    "y": 375
                },
                {
                    "x": 395,
                    "y": 375
                },
                {
                    "x": 370,
                    "y": 560
                },
                {
                    "x": 20,
                    "y": 560
                }
            ]
        },
        {
            "name": "tunnel_wall_left",
            "category": "boundary",
            "polygon_top_down": [
                {
                    "x": 0,
                    "y": 320
                },
                {
                    "x": 55,
                    "y": 320
                },
                {
                    "x": 75,
                    "y": 575
                },
                {
                    "x": 0,
                    "y": 575
                }
            ]
        },
        {
            "name": "tunnel_wall_right",
            "category": "boundary",
            "polygon_top_down": [
                {
                    "x": 600,
                    "y": 320
                },
                {
                    "x": 640,
                    "y": 320
                },
                {
                    "x": 640,
                    "y": 575
                },
                {
                    "x": 585,
                    "y": 575
                }
            ]
        }
    ],
    "current_location": "roadway",
    "connections": [
        {
            "from": "vehicle_1",
            "relation": "is_on",
            "to": "right_lane"
        },
        {
            "from": "vehicle_2",
            "relation": "is_on",
            "to": "left_lane"
        },
        {
            "from": "vehicle_3",
            "relation": "is_on",
            "to": "roadway"
        },
        {
            "from": "streetlight_1",
            "relation": "is_near",
            "to": "roadway"
        },
        {
            "from": "streetlight_2",
            "relation": "is_near",
            "to": "roadway"
        },
        {
            "from": "left_lane",
            "relation": "bounded_by",
            "to": "tunnel_wall_left"
        },
        {
            "from": "right_lane",
            "relation": "bounded_by",
            "to": "tunnel_wall_right"
        }
    ],
    "plans": [
        {
            "plan_name": "continue_straight",
            "target_region": "roadway",
            "notes": "Maintain lane position through the tunnel."
        }
    ]
}