Long-Term Effectiveness of Radar Speed Display Signs in a University Environment

Vehicular speeds are of particular interest in areas with a high number of pedestrians due to the fact that 14-percent of all fatal crashes involve pedestrians. This study investigated the effect of a radar speed display sign placed for an extended period of time, at a location frequented by law enforcement on a road segment entering a university campus with a high number of pedestrians and vehicle speed violations. The statistical analysis included a comparison between AM peak, PM peak, and midday speeds collected one year apart. The data suggested that radar speed display signs can remain effective over a long period of time;causing drivers to decelerate when warned of a speeding violation. While other studies have examined long-term impacts of similar technologies, none have included a road entering a University campus. Thus, these findings support that other similar locations entering university campuses could see long-term benefits to stationary radar speed display signs.

三维雷达显示器系统仿真

传统的PPI显示器仅能显示二维信息,缺乏高度信息,不能直观显示三维信息,而三维雷达显示器以立体的方式显示雷达信息,能给观察者提供更多、更丰富的信息。文中设计了三维雷达显示器的系统总体方案,并针对方案介绍了相应三维显示的透视投影与视见体、多分辨率地形四叉树表示、三维目标模型显示等关键技术,以及系统仿真的流程。仿真结果表明三维显示器的效果很显著,系统方案可行,为三维雷达显示器的进一步研究与实现提供了良好的基础。