ISO 24298:2025

Overview

ISO 24298:2025 - Intelligent transport systems - Public transport - Light emitting diode (LED) destination board system for public transport buses - defines constructional and performance requirements and test methods for LED destination board systems (LEDDBS) used on all categories of buses and coaches (including mini/midi buses). The standard covers the complete system (LED display, controllers, and associated software/hardware), inward- and outward-facing displays, and options such as synchronized voice (GNSS-assisted announcements with manual override). Its aim is to ensure consistent visibility, reliability and safety of destination boards used for passenger information.

Key Topics

• Scope and definitions: terms such as LEDDBS, visibility distance, LED matrix, pitch, rated voltage and sampling lot are defined to support consistent implementation.
• Construction and types: requirements for display area, LED matrix layout, rated voltage and controller types (including controller performance and functional classification).
• Performance requirements: visibility, colour, flicker, functional status classification and endurance expectations to ensure legibility and passenger safety.
• Comprehensive test suite: classification into type tests and acceptance tests, plus specific tests including:
  • Functional and performance tests (minimum visibility distance, colour, flicker)
  • Electrical tests (insulation resistance, reverse polarity, high voltage, transient tests, EMI/EMC, ESD)
  • Environmental and mechanical tests (vibration, high/low temperature, damp heat, ingress protection/IP, corrosion resistance)
  • Wiring and materials tests (flammability and electrical properties of harnesses)
  • Endurance and reliability tests
• Marking and documentation: requirements for identification and conformity information on LEDDBS.
• Annexes: additional functional requirements and corrosion resistance test procedures.

Applications

• Transit agencies and operators: procurement specifications to ensure readable, reliable destination displays across fleets.
• OEMs and suppliers: design and manufacture of compliant LED destination boards, controllers and integrated systems.
• Systems integrators and installers: guidance on installation, wiring and environmental protection to meet performance and safety tests.
• Test laboratories and conformity assessors: test methods and acceptance criteria for type and lot testing.
  Practical benefits include improved passenger information, reduced perceived wait times, consistent route signage, and enhanced system reliability and interoperability.

Related standards

Normative references cited in ISO 24298:2025 include:

• ISO 7637-2 (electrical transients)
• ISO 10605 (electrostatic discharge)
• ISO 16750-2 (road vehicle electrical loads)
• IEC 60529 (IP code)
• IEC 60947-1 (low-voltage switchgear)
• ISO 11452-2 (radiated immunity)
• CISPR 25 (vehicle radio disturbance)
• ISO 9772 (flammability test for small specimens)
• JIS C 3406 (automotive cables)

For full technical requirements, test procedures and compliance details consult the official ISO 24298:2025 publication or your national standards body.