ISO 17361:2017

Overview

ISO 17361:2017 - Intelligent transport systems - Lane departure warning systems - Performance requirements and test procedures - defines the functional, human‑machine interface (HMI) and test requirements for in‑vehicle lane departure warning systems (LDWS). It applies to passenger cars, commercial vehicles and buses operating on highways and highway‑like roads. The standard covers system definition, classification, required and optional functions, measurable performance limits and standardized test procedures. It excludes warnings in sections with temporary or irregular lane markings (e.g., roadworks). ISO 17361:2017 makes clear that LDWS issue warnings only; they do not take automatic control and vehicle safety remains the driver’s responsibility.

Key topics and technical requirements

• System scope and definitions: lane, visible lane marking, incidental visible road feature, lane boundary, departure, warning issue point, TTLC (time to line crossing) and warning threshold placement zones.
• Classification: two classes based on curvature and minimum operating speeds:
  • Class I: radius ≥ 500 m, operable ≥ 20 m/s
  • Class II: radius ≥ 250 m, operable ≥ 17 m/s
• Operational requirements:
  • Detect lateral vehicle position and determine warning conditions.
  • Latest warning line at 0.3 m outside the lane boundary for passenger cars, 1 m for trucks and buses.
  • Earliest warning line defined by rate of departure (see Table 2): e.g., at very low lateral rates D = 0.75 m, for 0.5 < V ≤ 1.0 m/s D = 1.5 × V, and D = 1.5 m for V > 1.0 m/s.
  • Minimize false alarms and ensure repeatability of warnings.
• Human‑Machine Interface (HMI):
  • Provide easily perceivable haptic and/or audible warnings.
  • Distinguish LDWS warnings from other systems (e.g., forward vehicle collision warnings).
  • Indicate system status (on/off, failure, incapable) clearly using standard symbols; document minimum operating speed and conditions for “system incapable” in the owner’s manual.
• Test methods and pass criteria:
  • Specifies test environment, course and vehicle conditions, installation/configuration, and procedures.
  • Includes warning generation, repeatability, and false alarm tests and lists recoverable parameters for verification.

Applications and users

• Designed for automotive OEMs, Tier‑1 suppliers, sensor and ADAS integrators, test labs, regulators and certification bodies.
• Useful when designing, validating or certifying LDWS technologies that use optical, electromagnetic, GPS or other sensors.
• Supports product specification, HMI design, system tuning to reduce false alarms and compliance testing for highway use.

Related standards

• ISO 11270 (referenced for visible lane‑marking definitions)
• Developed under ISO/TC 204 (Intelligent transport systems) - consult for related ITS standards and test practices.

Keywords: ISO 17361, lane departure warning systems, LDWS, intelligent transport systems, performance requirements, test procedures, HMI, false alarm, repeatability, ADAS.