ISO 11270

Intelligent transport systems — Lane keeping assistance systems (LKAS) — Performance requirements and test procedures

ISO 17387

Intelligent Transportation Systems – Lane Change Decision Aid Systems (LCDAS) – Performance requirements and test procedures

jerk

third derivative with respect to time of the position of an object; equivalently the rate of change of the acceleration of an object; considered a measure of harshness of vehicle motion

third derivative with respect to time of the position of an object; equivalently the rate of change of the acceleration of an object; considered a measure of harshness of vehicle motion

judgement distance

distance travelled by a vehicle until the driver judges what action is to be taken after having received information about a traffic impediment

distance travelled by a vehicle until the driver judges what action is to be taken after having received information about a traffic impediment

lane boundary

borderline of the lane that is determined by a visible lane marking; and in the absence of a visible lane marking, by incidental visible road features or other means such as GPS, magnetic nails, etc
NOTE 1 to entry: In the case of a visible lane marking, the boundary is at the center thereof.

borderline of the lane that is determined by a visible lane marking; and in the absence of a visible lane marking, by incidental visible road features or other means such as GPS, magnetic nails, etc
NOTE 1 to entry: In the case of a visible lane marking, the boundary is at the center thereof.

lane departure

point of departure across the lane boundary

point of departure across the lane boundary

lane departure warning

warning given to the driver in accordance with the lane departure warning condition in the absence of suppression requests

warning given to the driver in accordance with the lane departure warning condition in the absence of suppression requests

LCDAS

lane change decision aid systems

lane change warning function

the lane change warning function is defined as a function that includes the blind spot warning function and the closing vehicle warning function

the lane change warning function is defined as a function that includes the blind spot warning function and the closing vehicle warning function

lane keeping actions

actions which the system performs to influence the lateral movement of the subject vehicle with the intention of helping the driver to keep the vehicle within the lane

actions which the system performs to influence the lateral movement of the subject vehicle with the intention of helping the driver to keep the vehicle within the lane

lane; traffic lane

portion of carriageway designed to accommodate a single line of moving road vehicles
NOTE 1 to entry: The term “lane” is often used to refer to a “traffic lane” when the context is known to be “traffic”.
NOTE 2 to entry: A traffic lane can be bi-directional, such as a single lane road, a two-way turn/overtaking lane, or a reversible flow lane.
NOTE 3 to entry: Some jurisdictions allow…

portion of carriageway designed to accommodate a single line of moving road vehicles
NOTE 1 to entry: The term “lane” is often used to refer to a “traffic lane” when the context is known to be “traffic”.
NOTE 2 to entry: A traffic lane can be bi-directional, such as a single lane road, a two-way turn/overtaking lane, or a reversible flow lane.
NOTE 3 to entry: Some jurisdictions allow supplemental uses of a traffic lane, such as multiple motorcycles sharing the width of a traffic lane or allowing a bicycle to use the edge of a lane.

lateral clearance

the lateral clearance of a target vehicle is defined as the lateral distance between the side of the subject vehicle and the near side of a target vehicle.

the lateral clearance of a target vehicle is defined as the lateral distance between the side of the subject vehicle and the near side of a target vehicle.

lateral offset

lateral distance between the longitudinal centerlines of a subject vehicle (SV) and a target vehicle (TV), measured as a percentage of the width of the SV, such that if the centers of the two vehicles are aligned, the value is zero

lateral distance between the longitudinal centerlines of a subject vehicle (SV) and a target vehicle (TV), measured as a percentage of the width of the SV, such that if the centers of the two vehicles are aligned, the value is zero

latest warning line

outermost limit of the warning threshold

outermost limit of the warning threshold

LCDAS target vehicle

any vehicle that is closing on the subject vehicle from behind, or any vehicle that is located in one of the adjacent zones

any vehicle that is closing on the subject vehicle from behind, or any vehicle that is located in one of the adjacent zones

level 1 driving automation; driver assistance

driver support system that provides either sustained lateral or sustained longitudinal vehicle motion control within a specific operational design domain with the expectation that a conventional driver completes the DDT
NOTE 1 to entry: Other driving automation levels include “level 2 driving automation”, “level 3 ADS”, “level 4 ADS”, and “level 5 ADS”.

driver support system that provides either sustained lateral or sustained longitudinal vehicle motion control within a specific operational design domain with the expectation that a conventional driver completes the DDT
NOTE 1 to entry: Other driving automation levels include “level 2 driving automation”, “level 3 ADS”, “level 4 ADS”, and “level 5 ADS”.

level 2 driving automation; partial driving automation

driver support system that provides sustained lateral and longitudinal vehicle motion control within a specific operational design domain with the expectation that a conventional driver completes the object and event detection and response
NOTE 1 to entry: Other driving automation levels include “level 1 driving automation”, “level 3 ADS”, “level 4 ADS”, and “level 5 ADS”.

driver support system that provides sustained lateral and longitudinal vehicle motion control within a specific operational design domain with the expectation that a conventional driver completes the object and event detection and response
NOTE 1 to entry: Other driving automation levels include “level 1 driving automation”, “level 3 ADS”, “level 4 ADS”, and “level 5 ADS”.

limited speed range adaptive cruise control; LSRA cruise control (LSRA)

class of adaptive cruise control systems, which allows the subject vehicle to follow a forward vehicle at an appropriate distance by controlling the engine and/or power train and the brake above a certain minimum velocity

class of adaptive cruise control systems, which allows the subject vehicle to follow a forward vehicle at an appropriate distance by controlling the engine and/or power train and the brake above a certain minimum velocity

LKAS active state

system is switched on and the activation criteria are met

system is switched on and the activation criteria are met

LKAS off state

system is switched off

system is switched off

LKAS on state

system is switched on

system is switched on

LKAS stand-by state

system is switched on but the activation criteria are not all met

system is switched on but the activation criteria are not all met

look ahead distance (V_max)

curve detection range of the CSWS
NOTE 1 to entry: For the curvature points that have radius of curvature ≤RC and the distances from the subject vehicle to the curved roads are < SLAD, the curvature point is considered to be a curvature point of interest.

curve detection range of the CSWS
NOTE 1 to entry: For the curvature points that have radius of curvature ≤RC and the distances from the subject vehicle to the curved roads are < SLAD, the curvature point is considered to be a curvature point of interest.

low speed following (LSF)

function that allows the subject vehicle to follow a forward vehicle in low speed ranges such as congested traffic at an appropriate distance by controlling the engine and/or power train and the brakes

function that allows the subject vehicle to follow a forward vehicle in low speed ranges such as congested traffic at an appropriate distance by controlling the engine and/or power train and the brakes

R_min

lower threshold of the operational range in terms of the radius of curvature (m)

LSF following state

condition where the system controls the clearance to the target vehicle according to the selected time gap

condition where the system controls the clearance to the target vehicle according to the selected time gap

LSF hold state

condition where the system controls the subject vehicle to be kept stationary

condition where the system controls the subject vehicle to be kept stationary

LSF re-targeting state

temporary target-lost period during a transition to the next target vehicle

temporary target-lost period during a transition to the next target vehicle

manoeuvring aid for low speed operation (MALSO)

system which, at low speeds (< 0,5 m/s), is capable of informing the driver of the presence of stationary obstacles in particular areas in close proximity to the subject vehicle, mainly during parking and manoeuvring in narrow passages

system which, at low speeds (< 0,5 m/s), is capable of informing the driver of the presence of stationary obstacles in particular areas in close proximity to the subject vehicle, mainly during parking and manoeuvring in narrow passages

a_test

maximum allowed acceleration during curve test