| 摘要 |
A method of assessing the movement of articles, such as motor vehicles, comprises first articles (V1) moving along a first path of movement transmitting signals representative of their respective speed and their identity. At least one second article (V2) moving along a second, opposite path of movement receives the signals from a plurality of the first articles, analyses the signals to select only the wanted signals, determines the nature of movement of the articles from speed data in the wanted signals, compiles a report containing the nature of movement of the articles together with an indication of the distance to the location at which signals from the first articles were received, and transmits the report. A third article (V3) travelling along the first path of movement behind the first articles receives the report from the second article, analyses the report and, if appropriate, displays the determined nature of movement of the first articles with a distance indicator to an occupant of the third vehicle. As the second article travels further and further from the site of the determination of the nature of the movement of the first articles it updates the distance indicator and after a predetermined distance of travel from the site or elapse of time, the second article discontinues transmission of the particular traffic report.
|
