数据来源于多模态智能交通信号系统（MMITSS）研究。MMITSS 是下一代交通信号系统，旨在为所有交通方式提供全面的交通信息框架。车载轨迹文件包含在路边设备（RSE）通信范围内的联网车辆所发送的基本安全消息。数据还包含用于车辆安全应用的附加车辆信息元素，以及用于数据事件快照的特定车辆状态信息元素，这些快照被收集并定期上报至路边设备。数据传输速率为每秒10次。注：所有附加文件均位于《多模态智能交通信号系统基本安全消息》中。

Data were collected during the Multi-Modal Intelligent Transportation Signal Systems (MMITSS) study. MMITSS is a next-generation traffic signal system that seeks to provide a comprehensive traffic information framework to service all modes of transportation. The Vehicle Trajectories file is populated with basic safety messages received from equipped vehicle within the communication range of an Roadside Equipment (RSEs). The data also contains elements that communicate additional details about the vehicle that is used for vehicle safety applications, and elements that communicate specific items of a vehicle‘s status that are used in data event snapshots which are gathered and periodically reported to an RSEs. These data are transmitted at a rate of 10 Hz. NOTE: All extra attachments are located in Multi-Modal Intelligent Traffic Signal Systems Basic Safety Message