This SAE recommended practice establishes a uniform@ powered vehicle T.P. for lane departure warning systems used in highway trucks and buses greater than 4@546 kg (10@000 lb) GVW. Systems similar in function but different in scope and complexity@ including Lane Keeping/Lane Assist and Merge Assist@ are not included in this T.P. This T.P. does not apply to trailers@ dollies@ etc. This T.P. does not intend to exclude any particular system or sensor technology. The specification will test the functionality of the LDWS (e.g.@ ability to detect lane presence@ and ability to detect an unintended lane departure)@ its ability to indicate LDWS engagement@ its ability to indicate LDWS disengagement@ and determine the point at which the LDWS notifies the Human Machine Interface (HMI) or vehicle control system that a lane departure event is detected. The HMI is not addressed herein@ but is considered in SAE Standard J2808.