stopped vehicles

vehicle that has stopped in a traffic lane or on the shoulder of the roadway

vehicle that has stopped in a traffic lane or on the shoulder of the roadway

stopping distance

distance, Xv, travelled by a vehicle with the speed of v, from the time the driver receives CIWS warning until the vehicle comes to a complete stop
NOTE 1 to entry: This includes the distance travelled during the driver perception and reaction time.

distance, Xv, travelled by a vehicle with the speed of v, from the time the driver receives CIWS warning until the vehicle comes to a complete stop
NOTE 1 to entry: This includes the distance travelled during the driver perception and reaction time.

straight

segment of road which curvature is less than 1/5 000 m

segment of road which curvature is less than 1/5 000 m

subject vehicle (SV)

vehicle equipped with a system related to the topic of discussion

vehicle equipped with a system related to the topic of discussion

subject vehicle speed

longitudinal component of the subject vehicle velocity

longitudinal component of the subject vehicle velocity

suppression request

driver request or a system feature intended to prevent an LKAS action if an intentional lane departure is detected

driver request or a system feature intended to prevent an LKAS action if an intentional lane departure is detected

system activation

action of transitioning the system operation from a quiescent mode to an active one in which the system is monitoring the monitoring ranges, evaluating the objects detected and generating appropriate feedback to assist the driver

action of transitioning the system operation from a quiescent mode to an active one in which the system is monitoring the monitoring ranges, evaluating the objects detected and generating appropriate feedback to assist the driver

system incapable

state of the system in which it is unable to warn the driver of a lane departure due to temporary conditions

state of the system in which it is unable to warn the driver of a lane departure due to temporary conditions

system states

one of several stages or phases of system operation

one of several stages or phases of system operation

target curvature point of interest

particular curvature point of interest on the roadway of the subject vehicle that CSWS is about to provide the warning to the driver
NOTE 1 to entry: CSWS selects the target curvature point of interest among the curvature points of interest and the curvature point of interest may vary depending upon the distance from the current location of the subject vehicle to the curvature point of…

particular curvature point of interest on the roadway of the subject vehicle that CSWS is about to provide the warning to the driver
NOTE 1 to entry: CSWS selects the target curvature point of interest among the curvature points of interest and the curvature point of interest may vary depending upon the distance from the current location of the subject vehicle to the curvature point of interest and the current speed of the subject vehicle. If a section of the curved road has a constant radius of the curvature, the curve start point becomes the target point of interest.

target vehicle (TV)

vehicle that the subject vehicle follows which may or may not be equipped with a connected vehicle device

vehicle that the subject vehicle follows which may or may not be equipped with a connected vehicle device

test object

object with a specific material, geometry and surface for testing the monitoring range
NOTE: This test object should give comparable results for the relevant sensor types.

object with a specific material, geometry and surface for testing the monitoring range
NOTE: This test object should give comparable results for the relevant sensor types.

V_test

test vehicle speed (m/s)

v

the true subject vehicle speed over ground

RC

threshold radius of curvature to define a curvature point of interest; the curvature point of interest is reached if the radius of the curvature of the particular location is less than RC (m)

time gap; gap; time gap between vehicles (τ)

value calculated from vehicle speed v and clearance c by τ = c/v
NOTE 1 to entry: v is the subject vehicle speed and c the distance between the subject vehicle and the forward vehicle.

value calculated from vehicle speed v and clearance c by τ = c/v
NOTE 1 to entry: v is the subject vehicle speed and c the distance between the subject vehicle and the forward vehicle.

time to arrive at stop line of intersection (TTAI)

time needed for a vehicle approaching the intersection at a speed of v to travel the distance, X, from its current location to the stop line

time needed for a vehicle approaching the intersection at a speed of v to travel the distance, X, from its current location to the stop line

time to collision (TTC)

estimated time that it will take a target vehicle to collide with the subject vehicle assuming the current closing speed remains constant
NOTE: Time to collision can be estimated by dividing a target vehicle’s rear clearance by its closing speed. This definition applies to target vehicles in the rear zones only.

estimated time that it will take a target vehicle to collide with the subject vehicle assuming the current closing speed remains constant
NOTE: Time to collision can be estimated by dividing a target vehicle’s rear clearance by its closing speed. This definition applies to target vehicles in the rear zones only.

time to curvature point of interest (t_TC)

travel time from the current position of the subject vehicle to the curvature point of interest and defined as follows tSV = Scurrent/Vcurrent where Vcurrent is the current speed of the subject vehicle

travel time from the current position of the subject vehicle to the curvature point of interest and defined as follows tSV = Scurrent/Vcurrent where Vcurrent is the current speed of the subject vehicle

time to line crossing (TTLC)

calculated time to lane departure
NOTE 1 to entry: For example, the most simple calculation method of this time (TTLC) is to divide lateral distance (D) between the predetermined part of the vehicle and the lane boundary by rate of departure (V_depart) of the vehicle relative to the lane. (TTLC = D/V_depart).

calculated time to lane departure
NOTE 1 to entry: For example, the most simple calculation method of this time (TTLC) is to divide lateral distance (D) between the predetermined part of the vehicle and the lane boundary by rate of departure (V_depart) of the vehicle relative to the lane. (TTLC = D/V_depart).

traffic impediment warning systems (TIWS)

system that automatically detects traffic impediments by employing sensors, reports occurrences of accidents to a traffic system operator, and provides information on the presence of traffic impediments to following vehicles before the cause is visible to them

system that automatically detects traffic impediments by employing sensors, reports occurrences of accidents to a traffic system operator, and provides information on the presence of traffic impediments to following vehicles before the cause is visible to them

ISO 15622

Transport information and control systems – Adaptive Cruise Control Systems (ACC) – Performance requirements and test procedures

ISO 15623

Transport information and control systems – Forward vehicle collision warning systems (FVCWS) – Performance requirements and test procedures

ISO TS 15624

Transport information and control systems – Traffic Impediment Warning Systems (TIWS) – System requirements

truck-tractor

heavy single-chassis vehicle providing propulsion, control, and crew (driver) accommodation, with the primary purpose of controlling and transporting one or more separate load-carrying trailers

heavy single-chassis vehicle providing propulsion, control, and crew (driver) accommodation, with the primary purpose of controlling and transporting one or more separate load-carrying trailers

unit truck

heavy single-chassis vehicle providing its own propulsion, control, and crew (driver) accommodation, with a significant cargo or other payload section

heavy single-chassis vehicle providing its own propulsion, control, and crew (driver) accommodation, with a significant cargo or other payload section

R_max

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

V_{WT_max}

upper threshold of the warning threshold speed (m/s)

A

utilised area, general for area

variable radius curve

curved road with two or more radii of curvature in the same direction

curved road with two or more radii of curvature in the same direction