智能运输系统.通过第2代（TPEG2）运输协议专家组的交通和旅行信息（TTI）.第18部分:交通流和预测应用（TPEG2-TFP）

[中文适用范围]： 本文档指定了 TPEG 应用程序流量和预测 (TFP)。 它专门设计用于使用不同渠道向各种接收者提供信息，首先包括数字广播和互联网技术。 交通流和预测消息适用于车载应用，也可以通过文本、语音和图形输出设备直接呈现给用户。 TFP 是面向状态的，即传输的信息不断更新接收器对专用道路网络的了解。 特别是，即使没有异常交通情况，也可以随时提供网络所有路段的交通状态。 一般来说，TFP关注以下需求： ——为动态导航系统提供最新的交通状态信息； ——保证驾驶员的出行安全； ——能够计算替代路线； ——避免延误（例如交通拥堵）； ——降低网络过饱和部分的流量负载； ——让驾驶员了解当前和即将到来的交通状况； ——紧凑且高效的交通信息编码。 [外文原描述]： This document specifies the TPEG application Traffic Flow and Prediction (TFP). It has been specifically designed to provide information to a variety of receivers using different channels, including in the first instance digital broadcasting and Internet technologies. Traffic flow and prediction messages are intended for in-car applications and can also be presented directly to the user by textual, voice and graphical output devices. TFP is status oriented, i.e. the transmitted information continuously updates the receiver's knowledge for a dedicated road network. In particular the traffic states are delivered any time and for all road sections of the network, even when there are no abnormal traffic situations. Generally, TFP focuses on the following requirements: — provides dynamic navigation systems with up-to-date traffic state information; — ensures travel safety for the driver; — enables the calculation of alternative routes; — avoids delays (e.g. traffic jams); — lowers traffic load on over-saturated parts of the network; — keeps the driver informed about current and upcoming traffic; — compact and efficient coding of the traffic information.