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

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

vehicle input device; input device

material entity that can affect the vehicle's operation
EXAMPLE: steering wheel, lever, pedal, knob, button, touch screen
NOTE 1 to entry: Input devices include those used to control the motion of the vehicle (e.g. a brake pedal), the state of vehicular equipment (e.g. headlight control), the configuration of the vehicle (e.g. temperature control), etc.

material entity that can affect the vehicle's operation
EXAMPLE: steering wheel, lever, pedal, knob, button, touch screen
NOTE 1 to entry: Input devices include those used to control the motion of the vehicle (e.g. a brake pedal), the state of vehicular equipment (e.g. headlight control), the configuration of the vehicle (e.g. temperature control), etc.

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

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

visible lane marking

delineators intentionally placed on the borderline of the lane that are directly visible by the driver while driving (e.g. not covered by snow, etc.)
NOTE: Refer to ISO 17361 Annex A for country 165 specific visible lane marking definitions.

delineators intentionally placed on the borderline of the lane that are directly visible by the driver while driving (e.g. not covered by snow, etc.)
NOTE: Refer to ISO 17361 Annex A for country 165 specific visible lane marking definitions.

visual information and warning

optical signal (e.g. a telltale or display) which is used to present relevant information to the driver

optical signal (e.g. a telltale or display) which is used to present relevant information to the driver

warning distance (S_warn)

distance from the location where the warning starts to the target curvature point of interest

distance from the location where the warning starts to the target curvature point of interest

warning end speed (V_{WT_end})

vehicle speed at which the CSWS transitions from CSWS warning state to CSWS non-warning so that the CSWS ends the warning

vehicle speed at which the CSWS transitions from CSWS warning state to CSWS non-warning so that the CSWS ends the warning

warning threshold

location where the warning is issued on the road, which corresponds to a warning trigger point set in the system
NOTE 1: In the case of TTLC, the warning threshold shifts depending on the rate of departure.
NOTE 2: The warning threshold is placed within the warning threshold placement zone.

location where the warning is issued on the road, which corresponds to a warning trigger point set in the system
NOTE 1: In the case of TTLC, the warning threshold shifts depending on the rate of departure.
NOTE 2: The warning threshold is placed within the warning threshold placement zone.

warning threshold placement zone

zone between the earliest and the latest warning lines within which the warning threshold is placed
NOTE: There is one warning threshold placement zone around the left lane boundary and one around the right lane boundary.

zone between the earliest and the latest warning lines within which the warning threshold is placed
NOTE: There is one warning threshold placement zone around the left lane boundary and one around the right lane boundary.

warning threshold speed (V_WT)

vehicle speed threshold that is used to determine if the CSWS warning is required
NOTE 1 to entry: If the vehicle speed measurement is greater than this threshold value, the CSWS provides the warning to the driver. This threshold is below the maximum speed that is defined by designed lateral acceleration to negotiate the upcoming curve.

vehicle speed threshold that is used to determine if the CSWS warning is required
NOTE 1 to entry: If the vehicle speed measurement is greater than this threshold value, the CSWS provides the warning to the driver. This threshold is below the maximum speed that is defined by designed lateral acceleration to negotiate the upcoming curve.

zone of regard

specific area behind the vehicle that is monitored by the ERBA system as defined in ISO 22840

specific area behind the vehicle that is monitored by the ERBA system as defined in ISO 22840