ISO 19638:2018 高度道路交通システム—道路境界逸脱防止システム（RBDPS）—性能要件とテスト手順 | ページ 6

3.1

control threshold

control trigger point set in the system where RBDPS control is issued

Note 1 to entry: In the case of TTLC (3.20) the control threshold shifts depending on the rate of departure.

Note 2 to entry: The control threshold is placed within the control threshold placement zone (see Figure 3).

3.2

control threshold placement zone

zone between the control threshold line and the latest control lines within which the control threshold is placed

Note 1 to entry: There is one control threshold placement zone at the inner side of the lane marking and one at the outer side of the lane marking (see Figure 3).

3.3

failure

inability of a system or system component to perform a required function within specified limits, which is caused by mechanical or electronic malfunction

Note 1 to entry: Temporary performance reductions, for example, due to bad weather conditions, bad lane markings, or temporary sensor blindness, are not considered a failure.

3.4

heavy vehicle

any single vehicle or combination of vehicles defined as Category M3, M2, N3, N2 in the United Nations Economic and Social Council World Forum for Harmonization of Vehicle Regulations (WP.29) ECE/TRANS/WP.29/78/Rev.2

3.5

lane

area of roadway delimited by visible lane markers between which, in the absence of any obstruction or intention on the part of the driver to change direction, a vehicle would be expected to travel

3.6

lane departure warning

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

3.7

latest control line

outermost limit of the control threshold

3.8

light duty passenger vehicle

vehicle defined as category M1 and N1 in the United Nations Economic and Social Council World Forum for Harmonization of Vehicle Regulations (WP.29) ECE/TRANS/WP.29/78/Rev.2

3.9

rate of departure

subject vehicle’s lateral component of the approach velocity to the road boundary at the control issue point

3.10

RBDPS action

action which the system performs to influence the lateral movement of the subject vehicle with the intention of assisting the driver to prevent departing the road boundaries

3.11

road

area for vehicular travel delineated by road boundaries

3.12

road boundary

innermost edge of visible, solid, markers between which a vehicle shall travel

Note 1 to entry: Refer to Table A.1 for a detailed definition.

3.13

road departure

situation in which the outermost edge of one of the front wheels with tyres of a vehicle or of the leading part of an articulated vehicle, or, in the case of a three-wheeled vehicle, the outside of one of the wheels on the axle with the widest track, is crossing a road boundary

Note 1 to entry: See Figure 3.

3.14

straight road

segment of road for which the curve radius is larger than 5 000 [m]

3.15

subject vehicle

vehicle equipped with RBDPS as defined herein

3.16

system states

one of several stages or phases of system operation

Note 1 to entry: See Figure 2.

3.17.1

RBDPS off state

state in which the system is switched off

3.17.2

RBDPS on state

state in which the system is switched on

3.17.3

RBDPS stand-by state

state in which the system is switched on but the activation criteria to issue intervention are not all met

3.17.4

RBDPS active state

state in which the system is switched on and the activation criteria to issue intervention are met

3.18

threshold for start timing of system support

maximum time threshold which may be set by the user for the start time of RBDPS support after the road boundary departure has started

3.19

threshold for support level of the system

maximum level of system support which may be set by the user

3.20

time to line crossing

TTLC

calculated time to the crossing of the solid line, leading to road 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 road boundary by rate of departure (Vdepart) of the vehicle relative to the lane (TTLC = D/Vdepart).

3.21

visibility

distance at which the illuminance of a non-diffusive beam of white light with a colour temperature of 2 700 K is decreased to 5 % of its original light source illuminance