本文件定义了警戒位置信息（VLI）的应用。 警戒信息用于车内应用，以告知驾驶员，由于危险的道路延伸、交通执法摄像头或其他危险位置，需要提高驾驶员警惕性，他们应该特别注意自己的驾驶行为。警告可以通过视觉、听觉、语音或三者的组合呈现。 向驾驶员展示此类信息可以让他们轻松驾驶，因为他们知道必要时会收到警告。警戒信息有意义的情况可能会非常不同。例如，测速摄像头通常放置在需要警惕的区域；关于这些地点的信息有助于安全驾驶，也有助于提高其他道路使用者和外部交通参与者的安全性。 另一个需要司机高度关注的区域是学校附近的道路。 这些信息可以通过两种方式进行分类: 固定或移动位置: -固定地点指的是性质固定的地点，例如存在已知的事故黑点。 -移动位置指的是本质上短暂的位置，例如存在移动测速摄像头。 地点或区域: -现场位置是指警告所在道路网络上的单点，指示受警戒信息影响的交通方向。 -区域是指道路网络的延伸，代表仅影响一个交通方向的连续警告区域。 根据国家或地区的不同，有关测速系统（如定速摄像头）或移动测速雷达位置信号的地方法规可能会有所不同。 某些市场的地方当局鼓励发送测速系统的信号，而在其他市场则可能受到法律的惩罚。

This document defines the application for Vigilance Location Information (VLI). Vigilance messages are intended for in-car applications to inform drivers when they should pay extra attention to their driving behaviour because of dangerous road stretches, traffic enforcement cameras or other hazardous locations, requiring increased driver vigilance. The warnings can be presented visually, audibly, or with the spoken voice, or as a combination of all three. The presentation of such messages to the drivers allows them to drive relaxed, in the knowledge that they will be warned when necessary. The situation where a vigilance message makes sense can be very different. For example speed cameras are usually placed in areas where vigilance is required; the information about those locations promote safe driving and also more safety for other road users and outside traffic participants. Another example for areas requiring high driver attention are roads close-by a school. The information can be categorized in two ways: Fixed or mobile locations: — Fixed locations refer to locations which are fixed of nature, such as the presence of known accident black-spots. — Mobile locations refer to locations which are transient in nature, such as the presence of a mobile speed camera. Spot locations or zones: — Spot locations refer to single points on a road network where the warning is located, with an indication of which direction of traffic is affected by the vigilance information. — Zones refer to stretches of road network which represent a continuous area of warning affecting only one traffic direction. The local regulations regarding the signalling of speed measurement systems, e.g. fixed speed cameras, or mobile speed radar locations can vary depending on the country or region. The signalling of speed measurement systems is encouraged by local authorities in certain markets whereas it can be punishable by law in other markets.