EOBR 是电子车载记录仪 （也叫行车记录仪），他是一种装载在商用车辆上面的电子设备，用来记录车辆被驾驶的总时间；有点类似于记录速度和驾驶时间的机器； EOBR 用在欧洲等同于美洲的数字 行车记录仪；

商用车司机（卡车和大巴司机）的驾驶时间 被 一套叫做HOS（服务时间）的规则所规范； HOS 用来避免疲劳驾驶，限制司机驾驶商用车的时间；

An electronic on-board recorder (EOBR) is an electronic device attached to a commercial motor vehicle, which is used to record the amount of time a vehicle is being driven. This is similar to the tachograph, and is the American equivalent of the digital tachograph used in Europe.

The driving hours of commercial drivers (truck and bus drivers) are regulated by a set of rules known as the hours of service (HOS). The HOS are rules intended to prevent driver fatigue, by limiting the amount of time drivers spend operating commercial vehicles.

Trucks in the European Union are required to have digital tachographs installed, and are securely monitored by government agencies. The U.S. Federal Motor Carrier Safety Administration is considering making EOBRs mandatory for all motor carriers. As of February 2008, it is only voluntary. Drivers and carriers are still allowed to use paper-based log books, which are subject to forgery.