ISO/TR 21974-1:2018 pdf download – Naturalistic driving studies — Vocabulary — Part 1: Safety critical events.
1 Scope This document defines terms and definitions commonly used for the annotation of video from NDSs collected during real-world driving in an uncontrolled setting. 2 Normative references There are no normative references in this document. 3? Terms? and? definitions ISO and IEC maintain terminological databases for use in standardization at the following URL addresses: — ISO Online browsing platform: available at https: //www .iso .org/obp — IEC Electropedia: available at http: //www .electropedia .org/ 3.1 combined avoidance capacity total response capacity of all responding conflict partners (3.3) Note 1 to entry: The capacity of a responding conflict partner takes into account both the abilities and limitations of the vehicle or road user as well as any environmental or infrastructural constraints, if present. Note 2 to entry: Conflict partners that do not exhibit an observable response are not included in this construct. 3.2 conflict situation where the trajectory(ies) of one or more road users or objects (conflict partner; 3.3) led to one of three results: 1) a crash (3.4) or road departure (3.12), 2) a situation where an evasive manoeuvre(s) (3.5) was required to avoid a crash or road departure, or 3) an unsafe proximity between the conflict partners Note 1 to entry: The key concept underlying the present framework is that of conflict. Note 2 to entry: Three general classes of traffic conflict are of interest in naturalistic driving analyses: trajectory conflict (3.2.1), single-vehicle conflict (3.2.2), and proximity conflict (3.2.3). 3.2.1 trajectory? conflict crash course between at least two conflict partners (3.3) 3.2.2 single-vehicle? conflict conflict (3.2) involving loss of vehicle control (e.g., horizontal and/or lateral skidding or rotation) or proximity to the road edges (e.g., road departure; 3.12) rather than proximity to another entity
3.2.3 proximity? conflict conflict (3.2) involving two or more entities that are not on a crash course but nevertheless come in close temporal and/or spatial proximity to a crash (3.4) 3.3 conflict? partner any entity that is part of a conflict (3.2) Note 1 to entry: This may include other vehicles (3.18), pedestrians (3.10), pedal cyclists (3.9), other non-motorists (3.8), other road users, animals, and objects (including roadside barriers that exceed the ground clearance of the affected vehicle). Note 2 to entry: If a conflict partner (3.3) is present, then the conflict is either a trajectory conflict (3.2.1) or a proximity conflict (3.2.3). Note 3 to entry: Low roadside barriers (e.g., curbs) within the ground clearance of the vehicle are not considered conflict partners. 3.4 crash situation in which the subject vehicle (i.e., instrumented vehicle; 3.14) has any contact with at least one other conflict partner (3.3) either on or off the trafficway (3.15), either moving or stationary (fixed or non-fixed), that is observable or in which kinetic energy is measurably transferred or dissipated Note 1 to entry: This excludes roadway (3.11) features meant to be driven over such as speed bumps and low roadside barriers (curbs, medians, etc.) within the ground clearance limitations of the vehicle. Note 2 to entry: A crash may also be a single-vehicle conflict (3.2.2) that includes at least one of the following conditions: vehicle rollover, airbag deployment, injury, more than 90° degrees of horizontal vehicle rotation, or all four tires leaving the trafficway.