DEFINITION
1. The emergency lane-keeping system (ELKS) is a driver assisting system that should provide warning to the driver and correct the trajectory only when the driver is unintentionally leaving the lane.

 
2. Corrective directional control function (CDCF) means a control function within an electronic control system whereby, for a limited duration, changes to the steering angle of one or more wheels and/or braking of individual wheels may result from the automatic evaluation of signals initiated on-board the vehicle optionally enriched by data provided off-board the vehicle, in order to correct lane departure, e.g. to avoid crossing lane markings, leaving the road.

 
3. Distance to lane marking (DTLM) means the remaining lateral distance (perpendicular to the lane marking) between the inner side of the lane marking and most outer edge of the tyre before the subject vehicle crosses the inner side of the lane marking.

 
GENERAL REQUIREMENTS
1. An emergency lane-keeping system (ELKS) shall comprise a lane departure warning system (LDWS) and a corrective directional control function (CDCF).

 
2. Subject to specific requirements below the system shall be designed to minimise warnings and interventions for driver intended manoeuvres. A warning shall be provided when there is a failure in the ELKS that prevents the requirements of this Regulation of being met. The failure warning shall be a constant visual warning signal.

 
3. The manual deactivation of the full ELKS shall not be possible with less than two deliberate actions, e.g. press and hold on a button, or select and confirm on menu option. It shall be possible to easily suppress acoustic warnings of the LDWS, but such action shall not at the same time deactivate the LDWS or the CDCF.

 
4. Automatic suppression of the ELKS is also permitted in situations when other driver assist or automated steering functions, (i.e. Automatically commanded steering function, emergency steering function or automated lane keeping), are controlling the lateral movement of the vehicle or other safety related functions (i.e. that is capable of changing the dynamic behaviour of the vehicle such as AEBS, ESC, etc.) are intervening.

 
5. The LDWS shall be active at least within the vehicle speed range between 65 km/h and 130 km/h (or the maximum vehicle speed if it is lower than 130 km/h) and at all vehicle load conditions, unless deactivated. The CDCF shall be active at least between 70 km/h and 130 km/h (or the maximum vehicle speed if it is below 130 km/h) and at all vehicle load conditions, unless deactivated.

 
6. When activated and operated within the prescribed speed range, the LDWS shall be able to warn the driver at the latest if the vehicle crosses over a visible lane marking for the lane in which it is running by more than a DTLM of – 0,3 m. In the absence of conditions leading to deactivation or suppression of the system, the CDCF shall be able to prevent lane departure by crossing of visible lane markings by more than a DTLM of – 0,3 m.

 
7.  The lane departure warning shall be noticeable by the driver and be provided by:
(a)  at least two warning means out of visual, acoustic and haptic; or
(b)  one warning means out of haptic and acoustic, with spatial indication about the direction of unintended drift of the vehicle.

 
8. When the CDCF is intervening, the steering control effort necessary to override the directional control provided by the system shall not exceed 50 N.

 
9. In the case of two or more consecutive CDCF interventions within a rolling interval of 180 seconds and in the absence of a steering input by the driver during this intervention, an acoustic warning signal shall be provided by the system during the second and any further intervention within a rolling interval of 180 seconds. Starting with the third intervention (and subsequent interventions) the acoustic warning signal shall continue for at least 10 seconds longer than the previous warning signal.

TESTING REQUIREMENTS
LDWS testing requirements: Drive the vehicle at a speed of 70 km/h +/– 3 km/h into the centre of the test lane in a smooth manner so that the attitude of the vehicle is stable. Gently drift the vehicle, either to the left or the right. The test requirements are fulfilled if the LDWS provides the lane departure warning indication at the latest when the DLTM is – 0,3 m.

 
CDCF testing requirements: The subject vehicle speed during the test up to the point of system intervention shall be 72km/h+/–1km/h. The curve of fixed radius driven to apply the lateral velocity required shall have a radius 1200 m or more. The test requirements are fulfilled if the subject vehicle does not cross the lane marking by a DTLM of more than – 0,3 m.

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