ISO 20712-3:2024

Overview

ISO 20712-3:2024 - Water safety signs and beach safety flags - Part 3: Guidance for use provides practical guidance for the selection, placement, use and upkeep of water safety signs (now incorporated in ISO 7010) and beach safety flags (as specified in ISO 20712-2) in aquatic environments. The fourth edition (2024) focuses on good practice for siting, mounting positions, lighting, inspection and maintenance, and on the design and layout of multiple sign assemblies. It excludes public highway traffic signs, maritime signalling, firing-range flags, water-quality flags and means-of-escape signage.

Key topics and technical requirements

• Selection and risk assessment - Guidance on assessing aquatic hazards and choosing appropriate signs and flags for beaches, pools and other water-edge locations.
• Siting and mounting - Recommendations for where to locate signs and flags, mounting positions and visibility considerations in variable environments.
• Sign visibility and distance - Discussion of sign height versus observation distance, including the distance factor (z = l/h) used to determine viewing ranges.
• Lighting and illumination - Guidance on lighting signs/flags where required for night or low-light conditions (colour matching reference: ISO 3864-4).
• Construction, durability and maintenance - Advice on materials, service schedules, inspection, storage and long-term upkeep to ensure continued legibility and performance.
• Beach safety flags - Application and operation of specific flag types (e.g., red, yellow, red/yellow, black/white, red/white and truncated orange cone), flagpole considerations, hoisting procedures, dimensions and maintenance.
• Multiple signs - Layout and presentation of combined sign panels, including typeface, type size, colour use, symbols, language and directional/approach/primary/secondary sign types.
• Informative annexes - Examples for swimming pools, flag positioning at beaches, typeface guidance and a distance-factor annex that supports practical implementation.

Practical applications and users

ISO 20712-3:2024 is intended for:

• Beach managers and local authorities planning coastal safety systems and flag protocols.
• Swimming-pool operators and facility designers setting up consistent water-safety signage.
• Lifeguard services and safety officers implementing clear, standardised messages.
• Sign manufacturers and suppliers producing compliant signs and flags.
• Health & safety professionals writing site-specific safety plans and maintenance schedules.

Use cases include designing sign layouts for new beach access points, auditing existing signage for visibility and durability, preparing maintenance regimes for flags/flagpoles, and creating unified multi-sign displays that improve public safety and familiarity.

Related standards

• ISO 7010 (graphical safety symbols - includes water safety signs)
• ISO 20712-2 (beach safety flag specifications)
• ISO 3864-4 (colourimetric and photometric properties for safety colours)
• ISO 22578 (tsunami signage - relocated specifications)