ISO 11270:2014

Overview

ISO 11270:2014 - “Intelligent transport systems - Lane keeping assistance systems (LKAS) - Performance requirements and test procedures” - defines minimum functionality, control strategy, driver interface elements, diagnostics and failure reactions, plus performance test procedures for LKAS. The standard targets highway and equivalent road use and is applicable to passenger cars, commercial vehicles and buses. It is explicit that LKAS provides driver support for safe lane keeping but does not perform automatic driving; vehicle safety responsibility remains with the driver.

Key topics and technical requirements

• System states and behavior: Defines LKAS states (Off, On, Stand‑by, Active), activation criteria and allowed state transitions.
• Activation criteria: At minimum the system must determine vehicle position relative to visible lane markings; manufacturers decide if one or both lane markings must be detected. Suppression requests (e.g., turn signal) and driver override must be supported.
• Operational limits: Specifies safe limits for induced vehicle motion:
  • Operational speed range: vmin = 20 m/s and vmax = 30 m/s (or up to vehicle maximum), with allowance for wider ranges.
  • Lateral acceleration and jerk limits (example values provided): LKAS_Lat_Acel_max = 3 m/s²; LKAS_Lat_Jerk_max = 5 m/s².
  • Limits on longitudinal deceleration induced by lane keeping actions.
  • Smooth fade‑out required when transitioning from Active to Stand‑by.
• Driver interface and indicators: Requirements for informing drivers about LKAS On/Active states, failures, and owner’s manual information. Use of standardized symbols (ISO 2575) is recommended.
• Diagnostics and failure reaction: Minimum diagnostic requirements and driver notification when LKAS becomes unavailable.
• Performance test procedures: Detailed test clauses cover environmental conditions, test course layout, test vehicle configuration and the test execution. Informative annexes include example test track geometry and national road marking examples.
• Scope exclusions: Sensor detection performance specifics and cooperative communication links are not addressed; temporary/irregular lane markings (e.g., roadworks) are out of scope.

Applications and users

Who uses ISO 11270:2014:

• Automotive OEMs and Tier‑1 suppliers designing LKAS features
• System integrators and HIL/SIL test engineers validating control strategies
• Independent test laboratories performing compliance and performance tests
• Regulators, vehicle safety engineers and fleet operators assessing LKAS behavior Practical uses include requirements definition, test planning, safety reviews, and verification of LKAS behaviour against internationally harmonized criteria.

Related standards

• Normative reference: ISO 2575 (road vehicle symbols for controls, indicators and tell‑tales).
• Developed by ISO/TC 204 (Intelligent transport systems).

Keywords: ISO 11270:2014, LKAS standard, Lane Keeping Assistance Systems, LKAS test procedures, intelligent transport systems, lane keeping performance, vehicle safety.