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      "steeringAngleDeg": 278.4144897461,
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  "radar_around_hits": [
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      "ttc_s": 2.8027585786,
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      "lead_y_m": -0.4399999976,
      "ttc_s": 2.6777779441,
      "thw_s": 2.5943366427,
      "thw_moving_s": null
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    {
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      "lead_valid": 0.0,
      "distance_m": 0.0,
      "relative_speed_mps": 0.0,
      "lead_y_m": 0.0,
      "ttc_s": null,
      "thw_s": null,
      "thw_moving_s": null
    },
    {
      "t": -0.342004395,
      "lead_valid": 0.0,
      "distance_m": 0.0,
      "relative_speed_mps": 0.0,
      "lead_y_m": 0.0,
      "ttc_s": null,
      "thw_s": null,
      "thw_moving_s": null
    },
    {
      "t": 2.165414672,
      "lead_valid": 0.0,
      "distance_m": 0.0,
      "relative_speed_mps": 0.0,
      "lead_y_m": 0.0,
      "ttc_s": null,
      "thw_s": null,
      "thw_moving_s": null
    },
    {
      "t": 2.415271525,
      "lead_valid": 1.0,
      "distance_m": 11.4799995422,
      "relative_speed_mps": -3.7249999046,
      "lead_y_m": -0.4399999976,
      "ttc_s": 3.0818791506,
      "thw_s": 3.1129939836,
      "thw_moving_s": null
    },
    {
      "t": 2.657025702,
      "lead_valid": 1.0,
      "distance_m": 10.720000267,
      "relative_speed_mps": -3.6749999523,
      "lead_y_m": 0.8000000119,
      "ttc_s": 2.9170069132,
      "thw_s": 2.9536559251,
      "thw_moving_s": null
    },
    {
      "t": 2.906972085,
      "lead_valid": 0.0,
      "distance_m": 0.0,
      "relative_speed_mps": 0.0,
      "lead_y_m": 0.0,
      "ttc_s": null,
      "thw_s": null,
      "thw_moving_s": null
    },
    {
      "t": 3.165372131,
      "lead_valid": 0.0,
      "distance_m": 0.0,
      "relative_speed_mps": 0.0,
      "lead_y_m": 0.0,
      "ttc_s": null,
      "thw_s": null,
      "thw_moving_s": null
    }
  ],
  "note": "低TTC仅事前2点、事后1点；目标随后失效且视频转向，无法确认连续同一目标。"
}