{
 "dataset": "accident-replay synthetic crash corpus",
 "generator_version": 2,
 "causal": "signals determine crash type via physics rule (see classify())",
 "scale": 100000,
 "seed": 4471,
 "records": 100000,
 "records_in_file": 50,
 "note": "This file holds a 50-row sample of the generated corpus described by scale/records. The full corpus is not published.",
 "grader_accuracy": 0.9875,
 "accuracy_target": 0.987,
 "corpus_hash": "b8427f206ab79fc3062cc0f5cf8fa91a8a7ecc307865e8a3a60a6cde3fa4739b",
 "sample": [
  {
   "incident_id": "SYN-000000",
   "vehicle_id": "V-8542",
   "timestamp": "2026-09-06T21:37:40Z",
   "signals": {
    "speed_kmh": 40,
    "brake_pct": 82,
    "gap_m": 6.5,
    "rain_mm_h": 0,
    "visibility_mi": 3.2,
    "delta_v_kmh": 23
   },
   "ground_truth": {
    "crash_type": "rear_end_following_too_close",
    "liability_read": "B primary - following too close",
    "stopping_distance_m": 24.9,
    "fraud_markers": false
   },
   "grader_matches_truth": true
  },
  {
   "incident_id": "SYN-000001",
   "vehicle_id": "V-7882",
   "timestamp": "2026-09-09T17:17:35Z",
   "signals": {
    "speed_kmh": 70,
    "brake_pct": 20,
    "gap_m": 69.9,
    "rain_mm_h": 2,
    "visibility_mi": 1.6,
    "delta_v_kmh": 29
   },
   "ground_truth": {
    "crash_type": "side_swipe_merge",
    "liability_read": "merging vehicle primary",
    "stopping_distance_m": 66.0,
    "fraud_markers": false
   },
   "grader_matches_truth": true
  },
  {
   "incident_id": "SYN-000002",
   "vehicle_id": "V-6690",
   "timestamp": "2026-09-01T18:44:07Z",
   "signals": {
    "speed_kmh": 60,
    "brake_pct": 95,
    "gap_m": 29.8,
    "rain_mm_h": 2,
    "visibility_mi": 2.3,
    "delta_v_kmh": 26
   },
   "ground_truth": {
    "crash_type": "rear_end_following_too_close",
    "liability_read": "B primary - following too close",
    "stopping_distance_m": 53.5,
    "fraud_markers": false
   },
   "grader_matches_truth": true
  },
  {
   "incident_id": "SYN-000003",
   "vehicle_id": "V-4860",
   "timestamp": "2026-09-08T13:33:29Z",
   "signals": {
    "speed_kmh": 40,
    "brake_pct": 20,
    "gap_m": 110.2,
    "rain_mm_h": 8,
    "visibility_mi": 5.8,
    "delta_v_kmh": 18
   },
   "ground_truth": {
    "crash_type": "side_swipe_merge",
    "liability_read": "merging vehicle primary",
    "stopping_distance_m": 31.6,
    "fraud_markers": false
   },
   "grader_matches_truth": true
  },
  {
   "incident_id": "SYN-000004",
   "vehicle_id": "V-6809",
   "timestamp": "2026-09-06T22:43:31Z",
   "signals": {
    "speed_kmh": 90,
    "brake_pct": 82,
    "gap_m": 5.8,
    "rain_mm_h": 2,
    "visibility_mi": 1.2,
    "delta_v_kmh": 42
   },
   "ground_truth": {
    "crash_type": "rear_end_following_too_close",
    "liability_read": "B primary - following too close",
    "stopping_distance_m": 94.2,
    "fraud_markers": false
   },
   "grader_matches_truth": true
  },
  {
   "incident_id": "SYN-000005",
   "vehicle_id": "V-9037",
   "timestamp": "2026-09-04T13:50:08Z",
   "signals": {
    "speed_kmh": 80,
    "brake_pct": 0,
    "gap_m": 93.3,
    "rain_mm_h": 2,
    "visibility_mi": 0.6,
    "delta_v_kmh": 40
   },
   "ground_truth": {
    "crash_type": "intersection_red_light",
    "liability_read": "cross traffic primary - red light violation",
    "stopping_distance_m": 79.6,
    "fraud_markers": false
   },
   "grader_matches_truth": true
  },
  {
   "incident_id": "SYN-000006",
   "vehicle_id": "V-2031",
   "timestamp": "2026-09-03T23:49:09Z",
   "signals": {
    "speed_kmh": 40,
    "brake_pct": 20,
    "gap_m": 4.4,
    "rain_mm_h": 2,
    "visibility_mi": 4.9,
    "delta_v_kmh": 25
   },
   "ground_truth": {
    "crash_type": "backing_collision",
    "liability_read": "reversing vehicle primary",
    "stopping_distance_m": 31.6,
    "fraud_markers": false
   },
   "grader_matches_truth": true
  },
  {
   "incident_id": "SYN-000007",
   "vehicle_id": "V-3117",
   "timestamp": "2026-09-08T14:37:48Z",
   "signals": {
    "speed_kmh": 80,
    "brake_pct": 0,
    "gap_m": 9.4,
    "rain_mm_h": 8,
    "visibility_mi": 3.4,
    "delta_v_kmh": 42
   },
   "ground_truth": {
    "crash_type": "intersection_red_light",
    "liability_read": "cross traffic primary - red light violation",
    "stopping_distance_m": 79.6,
    "fraud_markers": false
   },
   "grader_matches_truth": true
  },
  {
   "incident_id": "SYN-000008",
   "vehicle_id": "V-9654",
   "timestamp": "2026-09-05T16:55:38Z",
   "signals": {
    "speed_kmh": 61,
    "brake_pct": 55,
    "gap_m": 58.1,
    "rain_mm_h": 2,
    "visibility_mi": 3.9,
    "delta_v_kmh": 19
   },
   "ground_truth": {
    "crash_type": "side_swipe_merge",
    "liability_read": "merging vehicle primary",
    "stopping_distance_m": 54.7,
    "fraud_markers": false
   },
   "grader_matches_truth": true
  },
  {
   "incident_id": "SYN-000009",
   "vehicle_id": "V-3595",
   "timestamp": "2026-09-04T17:58:36Z",
   "signals": {
    "speed_kmh": 40,
    "brake_pct": 55,
    "gap_m": 6.1,
    "rain_mm_h": 2,
    "visibility_mi": 3.0,
    "delta_v_kmh": 20
   },
   "ground_truth": {
    "crash_type": "rear_end_following_too_close",
    "liability_read": "B primary - following too close",
    "stopping_distance_m": 31.6,
    "fraud_markers": false
   },
   "grader_matches_truth": true
  },
  {
   "incident_id": "SYN-000010",
   "vehicle_id": "V-2652",
   "timestamp": "2026-09-06T06:34:14Z",
   "signals": {
    "speed_kmh": 70,
    "brake_pct": 95,
    "gap_m": 40.0,
    "rain_mm_h": 2,
    "visibility_mi": 2.7,
    "delta_v_kmh": 27
   },
   "ground_truth": {
    "crash_type": "side_swipe_merge",
    "liability_read": "merging vehicle primary",
    "stopping_distance_m": 66.0,
    "fraud_markers": false
   },
   "grader_matches_truth": true
  },
  {
   "incident_id": "SYN-000011",
   "vehicle_id": "V-9625",
   "timestamp": "2026-09-01T00:08:36Z",
   "signals": {
    "speed_kmh": 60,
    "brake_pct": 95,
    "gap_m": 29.3,
    "rain_mm_h": 0,
    "visibility_mi": 5.9,
    "delta_v_kmh": 21
   },
   "ground_truth": {
    "crash_type": "rear_end_following_too_close",
    "liability_read": "B primary - following too close",
    "stopping_distance_m": 43.5,
    "fraud_markers": false
   },
   "grader_matches_truth": true
  },
  {
   "incident_id": "SYN-000012",
   "vehicle_id": "V-3798",
   "timestamp": "2026-09-01T16:37:52Z",
   "signals": {
    "speed_kmh": 60,
    "brake_pct": 95,
    "gap_m": 23.8,
    "rain_mm_h": 0,
    "visibility_mi": 0.9,
    "delta_v_kmh": 24
   },
   "ground_truth": {
    "crash_type": "rear_end_following_too_close",
    "liability_read": "B primary - following too close",
    "stopping_distance_m": 43.5,
    "fraud_markers": false
   },
   "grader_matches_truth": true
  },
  {
   "incident_id": "SYN-000013",
   "vehicle_id": "V-7452",
   "timestamp": "2026-09-02T05:41:12Z",
   "signals": {
    "speed_kmh": 70,
    "brake_pct": 55,
    "gap_m": 161.4,
    "rain_mm_h": 0,
    "visibility_mi": 5.9,
    "delta_v_kmh": 12
   },
   "ground_truth": {
    "crash_type": "side_swipe_merge",
    "liability_read": "merging vehicle primary",
    "stopping_distance_m": 54.4,
    "fraud_markers": false
   },
   "grader_matches_truth": true
  },
  {
   "incident_id": "SYN-000014",
   "vehicle_id": "V-4620",
   "timestamp": "2026-09-04T17:31:52Z",
   "signals": {
    "speed_kmh": 61,
    "brake_pct": 95,
    "gap_m": 3.7,
    "rain_mm_h": 0,
    "visibility_mi": 1.7,
    "delta_v_kmh": 37
   },
   "ground_truth": {
    "crash_type": "rear_end_following_too_close",
    "liability_read": "B primary - following too close",
    "stopping_distance_m": 44.6,
    "fraud_markers": false
   },
   "grader_matches_truth": true
  },
  {
   "incident_id": "SYN-000015",
   "vehicle_id": "V-3664",
   "timestamp": "2026-09-07T06:08:16Z",
   "signals": {
    "speed_kmh": 40,
    "brake_pct": 95,
    "gap_m": 3.3,
    "rain_mm_h": 4,
    "visibility_mi": 5.4,
    "delta_v_kmh": 22
   },
   "ground_truth": {
    "crash_type": "rear_end_following_too_close",
    "liability_read": "B primary - following too close",
    "stopping_distance_m": 31.6,
    "fraud_markers": false
   },
   "grader_matches_truth": true
  },
  {
   "incident_id": "SYN-000016",
   "vehicle_id": "V-9633",
   "timestamp": "2026-09-02T08:12:30Z",
   "signals": {
    "speed_kmh": 40,
    "brake_pct": 82,
    "gap_m": 112.0,
    "rain_mm_h": 0,
    "visibility_mi": 0.9,
    "delta_v_kmh": 12
   },
   "ground_truth": {
    "crash_type": "side_swipe_merge",
    "liability_read": "merging vehicle primary",
    "stopping_distance_m": 24.9,
    "fraud_markers": false
   },
   "grader_matches_truth": true
  },
  {
   "incident_id": "SYN-000017",
   "vehicle_id": "V-5448",
   "timestamp": "2026-09-04T17:43:34Z",
   "signals": {
    "speed_kmh": 70,
    "brake_pct": 0,
    "gap_m": 147.8,
    "rain_mm_h": 0,
    "visibility_mi": 1.2,
    "delta_v_kmh": 42
   },
   "ground_truth": {
    "crash_type": "intersection_red_light",
    "liability_read": "cross traffic primary - red light violation",
    "stopping_distance_m": 54.4,
    "fraud_markers": false
   },
   "grader_matches_truth": true
  },
  {
   "incident_id": "SYN-000018",
   "vehicle_id": "V-9991",
   "timestamp": "2026-09-07T15:09:42Z",
   "signals": {
    "speed_kmh": 70,
    "brake_pct": 82,
    "gap_m": 3.9,
    "rain_mm_h": 0,
    "visibility_mi": 1.0,
    "delta_v_kmh": 40
   },
   "ground_truth": {
    "crash_type": "rear_end_following_too_close",
    "liability_read": "B primary - following too close",
    "stopping_distance_m": 54.4,
    "fraud_markers": false
   },
   "grader_matches_truth": true
  },
  {
   "incident_id": "SYN-000019",
   "vehicle_id": "V-7523",
   "timestamp": "2026-09-02T12:22:13Z",
   "signals": {
    "speed_kmh": 30,
    "brake_pct": 0,
    "gap_m": 96.3,
    "rain_mm_h": 4,
    "visibility_mi": 4.4,
    "delta_v_kmh": 18
   },
   "ground_truth": {
    "crash_type": "side_swipe_merge",
    "liability_read": "merging vehicle primary",
    "stopping_distance_m": 22.1,
    "fraud_markers": false
   },
   "grader_matches_truth": true
  },
  {
   "incident_id": "SYN-000020",
   "vehicle_id": "V-2838",
   "timestamp": "2026-09-04T22:17:59Z",
   "signals": {
    "speed_kmh": 40,
    "brake_pct": 0,
    "gap_m": 33.4,
    "rain_mm_h": 4,
    "visibility_mi": 2.8,
    "delta_v_kmh": 24
   },
   "ground_truth": {
    "crash_type": "side_swipe_merge",
    "liability_read": "merging vehicle primary",
    "stopping_distance_m": 31.6,
    "fraud_markers": false
   },
   "grader_matches_truth": true
  },
  {
   "incident_id": "SYN-000021",
   "vehicle_id": "V-5653",
   "timestamp": "2026-09-05T08:52:44Z",
   "signals": {
    "speed_kmh": 90,
    "brake_pct": 20,
    "gap_m": 48.9,
    "rain_mm_h": 0,
    "visibility_mi": 1.5,
    "delta_v_kmh": 40
   },
   "ground_truth": {
    "crash_type": "rear_end_lane_change_conflict",
    "liability_read": "shared - A cut into B's braking envelope",
    "stopping_distance_m": 79.2,
    "fraud_markers": false
   },
   "grader_matches_truth": true
  },
  {
   "incident_id": "SYN-000022",
   "vehicle_id": "V-7302",
   "timestamp": "2026-09-05T16:03:11Z",
   "signals": {
    "speed_kmh": 90,
    "brake_pct": 95,
    "gap_m": 8.5,
    "rain_mm_h": 8,
    "visibility_mi": 1.1,
    "delta_v_kmh": 42
   },
   "ground_truth": {
    "crash_type": "rear_end_following_too_close",
    "liability_read": "B primary - following too close",
    "stopping_distance_m": 94.2,
    "fraud_markers": false
   },
   "grader_matches_truth": true
  },
  {
   "incident_id": "SYN-000023",
   "vehicle_id": "V-7343",
   "timestamp": "2026-09-08T14:44:37Z",
   "signals": {
    "speed_kmh": 40,
    "brake_pct": 55,
    "gap_m": 7.0,
    "rain_mm_h": 0,
    "visibility_mi": 4.9,
    "delta_v_kmh": 19
   },
   "ground_truth": {
    "crash_type": "rear_end_following_too_close",
    "liability_read": "B primary - following too close",
    "stopping_distance_m": 24.9,
    "fraud_markers": false
   },
   "grader_matches_truth": true
  },
  {
   "incident_id": "SYN-000024",
   "vehicle_id": "V-6671",
   "timestamp": "2026-09-06T10:27:47Z",
   "signals": {
    "speed_kmh": 30,
    "brake_pct": 55,
    "gap_m": 104.1,
    "rain_mm_h": 0,
    "visibility_mi": 0.6,
    "delta_v_kmh": 12
   },
   "ground_truth": {
    "crash_type": "side_swipe_merge",
    "liability_read": "merging vehicle primary",
    "stopping_distance_m": 17.1,
    "fraud_markers": false
   },
   "grader_matches_truth": false
  },
  {
   "incident_id": "SYN-000025",
   "vehicle_id": "V-8876",
   "timestamp": "2026-09-02T22:31:41Z",
   "signals": {
    "speed_kmh": 40,
    "brake_pct": 55,
    "gap_m": 41.2,
    "rain_mm_h": 2,
    "visibility_mi": 2.1,
    "delta_v_kmh": 12
   },
   "ground_truth": {
    "crash_type": "side_swipe_merge",
    "liability_read": "merging vehicle primary",
    "stopping_distance_m": 31.6,
    "fraud_markers": false
   },
   "grader_matches_truth": true
  },
  {
   "incident_id": "SYN-000026",
   "vehicle_id": "V-6220",
   "timestamp": "2026-09-09T21:14:34Z",
   "signals": {
    "speed_kmh": 80,
    "brake_pct": 0,
    "gap_m": 33.1,
    "rain_mm_h": 2,
    "visibility_mi": 0.6,
    "delta_v_kmh": 42
   },
   "ground_truth": {
    "crash_type": "intersection_red_light",
    "liability_read": "cross traffic primary - red light violation",
    "stopping_distance_m": 79.6,
    "fraud_markers": false
   },
   "grader_matches_truth": true
  },
  {
   "incident_id": "SYN-000027",
   "vehicle_id": "V-2826",
   "timestamp": "2026-09-09T23:26:59Z",
   "signals": {
    "speed_kmh": 80,
    "brake_pct": 82,
    "gap_m": 45.4,
    "rain_mm_h": 0,
    "visibility_mi": 3.5,
    "delta_v_kmh": 28
   },
   "ground_truth": {
    "crash_type": "side_swipe_merge",
    "liability_read": "merging vehicle primary",
    "stopping_distance_m": 66.3,
    "fraud_markers": false
   },
   "grader_matches_truth": true
  },
  {
   "incident_id": "SYN-000028",
   "vehicle_id": "V-6913",
   "timestamp": "2026-09-08T13:22:14Z",
   "signals": {
    "speed_kmh": 50,
    "brake_pct": 95,
    "gap_m": 19.1,
    "rain_mm_h": 8,
    "visibility_mi": 2.8,
    "delta_v_kmh": 22
   },
   "ground_truth": {
    "crash_type": "rear_end_following_too_close",
    "liability_read": "B primary - following too close",
    "stopping_distance_m": 42.0,
    "fraud_markers": false
   },
   "grader_matches_truth": true
  },
  {
   "incident_id": "SYN-000029",
   "vehicle_id": "V-9137",
   "timestamp": "2026-09-06T08:46:30Z",
   "signals": {
    "speed_kmh": 50,
    "brake_pct": 95,
    "gap_m": 83.7,
    "rain_mm_h": 8,
    "visibility_mi": 4.8,
    "delta_v_kmh": 18
   },
   "ground_truth": {
    "crash_type": "side_swipe_merge",
    "liability_read": "merging vehicle primary",
    "stopping_distance_m": 42.0,
    "fraud_markers": false
   },
   "grader_matches_truth": true
  },
  {
   "incident_id": "SYN-000030",
   "vehicle_id": "V-8402",
   "timestamp": "2026-09-09T11:26:10Z",
   "signals": {
    "speed_kmh": 40,
    "brake_pct": 82,
    "gap_m": 11.1,
    "rain_mm_h": 8,
    "visibility_mi": 6.0,
    "delta_v_kmh": 19
   },
   "ground_truth": {
    "crash_type": "rear_end_following_too_close",
    "liability_read": "B primary - following too close",
    "stopping_distance_m": 31.6,
    "fraud_markers": false
   },
   "grader_matches_truth": true
  },
  {
   "incident_id": "SYN-000031",
   "vehicle_id": "V-2304",
   "timestamp": "2026-09-08T17:38:31Z",
   "signals": {
    "speed_kmh": 40,
    "brake_pct": 82,
    "gap_m": 74.1,
    "rain_mm_h": 0,
    "visibility_mi": 0.7,
    "delta_v_kmh": 12
   },
   "ground_truth": {
    "crash_type": "side_swipe_merge",
    "liability_read": "merging vehicle primary",
    "stopping_distance_m": 24.9,
    "fraud_markers": false
   },
   "grader_matches_truth": true
  },
  {
   "incident_id": "SYN-000032",
   "vehicle_id": "V-8099",
   "timestamp": "2026-09-05T01:57:00Z",
   "signals": {
    "speed_kmh": 40,
    "brake_pct": 55,
    "gap_m": 38.2,
    "rain_mm_h": 8,
    "visibility_mi": 3.1,
    "delta_v_kmh": 12
   },
   "ground_truth": {
    "crash_type": "side_swipe_merge",
    "liability_read": "merging vehicle primary",
    "stopping_distance_m": 31.6,
    "fraud_markers": false
   },
   "grader_matches_truth": true
  },
  {
   "incident_id": "SYN-000033",
   "vehicle_id": "V-3027",
   "timestamp": "2026-09-03T13:30:08Z",
   "signals": {
    "speed_kmh": 80,
    "brake_pct": 20,
    "gap_m": 3.5,
    "rain_mm_h": 0,
    "visibility_mi": 2.8,
    "delta_v_kmh": 42
   },
   "ground_truth": {
    "crash_type": "side_swipe_merge",
    "liability_read": "merging vehicle primary",
    "stopping_distance_m": 66.3,
    "fraud_markers": false
   },
   "grader_matches_truth": true
  },
  {
   "incident_id": "SYN-000034",
   "vehicle_id": "V-5408",
   "timestamp": "2026-09-09T00:21:42Z",
   "signals": {
    "speed_kmh": 60,
    "brake_pct": 55,
    "gap_m": 3.2,
    "rain_mm_h": 0,
    "visibility_mi": 0.5,
    "delta_v_kmh": 35
   },
   "ground_truth": {
    "crash_type": "rear_end_following_too_close",
    "liability_read": "B primary - following too close",
    "stopping_distance_m": 43.5,
    "fraud_markers": false
   },
   "grader_matches_truth": true
  },
  {
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 ]
}