TrafficModel
透過集合功能整理內容
你可以依據偏好儲存及分類內容。
這個欄位會指定下列其中一項假設，用來計算交通狀況下的旅行時間 (如下列列舉所示)。視所選列舉而定，TrafficModel 回應的 duration 欄位會有所不同。這個值包含根據歷來平均值預估的交通時間。TrafficModel 僅適用於將 RoutingPreferenceTRAFFIC_AWARE_OPTIMAL，並將 RouteTravelModeDRIVE 的要求。
| 列舉 |
TRAFFIC_MODEL_UNSPECIFIED |
未使用。如未指定，則會預設為 BEST_GUESS。 |
BEST_GUESS |
表示傳回的 duration 應是最準確的預估交通時間 (根據歷來路況和即時車流量兩者的已知相關資訊計算而得)。departureTime 距離現在的時間越近，即時車流量的影響力就越大。 |
PESSIMISTIC |
表示傳回的時間長度在大多數日子應該都會比實際交通時間長，但偶爾路況特別差時，實際交通時間可能會超過這個值。 |
OPTIMISTIC |
表示傳回的時間在大多數日子應該都會比實際交通時間短，但偶爾路況特別好時，實際交通時間可能會短於這個值。 |
除非另有註明，否則本頁面中的內容是採用創用 CC 姓名標示 4.0 授權，程式碼範例則為阿帕契 2.0 授權。詳情請參閱《Google Developers 網站政策》。Java 是 Oracle 和/或其關聯企業的註冊商標。
上次更新時間：2025-08-31 (世界標準時間)。
[null,null,["上次更新時間：2025-08-31 (世界標準時間)。"],[[["\u003cp\u003eThe \u003ccode\u003eduration\u003c/code\u003e field provides estimated travel time influenced by the \u003ccode\u003etraffic_model\u003c/code\u003e setting.\u003c/p\u003e\n"],["\u003cp\u003e\u003ccode\u003etraffic_model\u003c/code\u003e options include \u003ccode\u003eBEST_GUESS\u003c/code\u003e (default), \u003ccode\u003ePESSIMISTIC\u003c/code\u003e, and \u003ccode\u003eOPTIMISTIC\u003c/code\u003e, impacting travel time predictions.\u003c/p\u003e\n"],["\u003cp\u003e\u003ccode\u003eBEST_GUESS\u003c/code\u003e considers historical and live traffic data for travel time estimation, with live traffic having more impact closer to departure.\u003c/p\u003e\n"],["\u003cp\u003e\u003ccode\u003ePESSIMISTIC\u003c/code\u003e and \u003ccode\u003eOPTIMISTIC\u003c/code\u003e offer durations longer and shorter than actual travel times on most days, respectively, accounting for traffic variations.\u003c/p\u003e\n"]]],["The core content outlines how to specify traffic-based time calculations, impacting the `duration` field. The `TRAFFIC_MODEL_UNSPECIFIED` defaults to `BEST_GUESS`, which uses historical and live data to estimate travel time. `PESSIMISTIC` calculates a longer travel time, likely exceeded only in severe conditions. Conversely, `OPTIMISTIC` calculates a shorter time, potentially beaten during favorable conditions. These options modify the estimated duration by factoring in historical traffic data and real-time conditions.\n"],null,["# TrafficModel\n\nSpecifies the assumptions to use when calculating time in traffic. This setting affects the value returned in the `duration` field in the response, which contains the predicted time in traffic based on historical averages.\n\n| Enums ||\n|-----------------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|\n| `TRAFFIC_MODEL_UNSPECIFIED` | Unused. If specified, will default to `BEST_GUESS`. |\n| `BEST_GUESS` | Indicates that the returned `duration` should be the best estimate of travel time given what is known about both historical traffic conditions and live traffic. Live traffic becomes more important the closer the `departureTime` is to now. |\n| `PESSIMISTIC` | Indicates that the returned duration should be longer than the actual travel time on most days, though occasional days with particularly bad traffic conditions may exceed this value. |\n| `OPTIMISTIC` | Indicates that the returned duration should be shorter than the actual travel time on most days, though occasional days with particularly good traffic conditions may be faster than this value. |"]]
