车道偏离警告（LDW）系统是一种防撞技术，它可以在驾驶员偏离（或已经偏离）车道或离开道路时发出警告。该警告系统旨在降低失控车祸的可能性。该系统不会控制车辆；它只会让驾驶员知道他/她需要转向回车道。LDW不是一个车道变更监视器，它可以处理有意的车道变更，也不是一个盲点监控系统，它可以警告相邻车道上的其他车辆。本信息报告适用于OEM和售后车道偏离警告系统，适用于在曲率半径大于等于500米的相对笔直道路上以及在良好天气条件下的轻型车辆（车辆总重额定值不超过8500磅）。

The Lane Departure Warning (LDW) system is a crash-avoidance technology which warns drivers if they are drifting (or have drifted) out of their lane or from the roadway. This warning system is designed to reduce the possibility of a run off road crash. This system will not take control of the vehicle; it will only let the driver know that he/she needs to steer back into the lane. An LDW is not a lane-change monitor, which addresses intentional lane changes, or a blind spot monitoring system which warns of other vehicles in adjacent lanes.This informational report applies to OEM and after-market Lane Departure Warning systems for light-duty vehicles (gross vehicle weight rating of no more than 8500 pounds) on relatively straight roads with a radius of curvature of 500 m or more, and under good weather conditions.