Using ISO 23456 and Paperless Solutions to Inspect Dynamic Signs

In many environments such as motorways, shopping centres, airports, and public buildings, dynamic signs provide information that changes in real time: variable speed limits, lane control signals, safety alerts, and wayfinding messages. These signs are inherently more complex than static equivalents, and their inspection is correspondingly more demanding. Pen-and-paper methods simply cannot capture the nuance of a fault in an electronic display the way a smartphone camera can.

The International Organization for Standardization (ISO) has addressed this gap directly with ISO 23456, a standard that simplifies and structures the process of inspecting dynamic and electronic signs. For any organisation that uses, maintains, or manufactures variable-message signs, combining ISO 23456 with a digital inspection solution is now the most effective way to ensure compliance and operational reliability.

What Are Dynamic Signs?

Dynamic signs are any signage whose displayed content can be altered, either manually or automatically, rather than showing a fixed message. They are found across a broad range of settings:

Because the content these signs display changes, their inspection cannot simply verify that a fixed image is present and undamaged. The inspector must confirm that the display mechanism itself functions correctly, that switching between states occurs reliably, and that fault conditions are logged and resolved promptly.

How ISO 23456 Simplifies Dynamic Sign Inspection

ISO 23456 provides a structured framework for inspecting these variable-message signs, establishing what should be checked, how frequently, and how faults should be categorised and escalated. The standard addresses the inspection of both the display technology and the control systems that govern sign operation, ensuring a complete picture of sign health rather than just surface-level visual checks.

The standard is particularly relevant for organisations responsible for motorway infrastructure and public building management, where the consequences of a failed dynamic sign range from minor inconvenience to serious safety incidents. A speed sign that fails to update during roadworks, or an evacuation sign that does not switch to the correct route during an emergency, carries real risk for users and real liability for operators.

By codifying what a compliant inspection looks like, ISO 23456 gives organisations a defensible baseline for their maintenance programs and supports a consistent approach across multiple sites or contractors. It also provides a shared language when engaging with sign manufacturers and service providers, reducing the ambiguity that often surrounds complex electronic assets. This is especially valuable in the context of broader compliance and quality assurance programs.

Why Digital Inspection Tools Are Essential for Dynamic Sign Compliance

Traditional inspection methods are poorly matched to the complexity of dynamic signs. A written note that a display panel "appears faulty" provides little actionable information. A photograph taken on a smartphone showing precisely which pixels have failed, annotated with the fault category from the ISO 23456 framework, is a qualitatively different piece of evidence. Digital inspection solutions running on smartphones and tablets give inspectors the tools they need to produce inspection records of this quality, consistently and efficiently.

Implementing a Compliant Dynamic Sign Inspection Program

Organisations beginning the process of aligning their dynamic sign maintenance with ISO 23456 can structure the transition in practical stages. The first step is to register all dynamic signs as assets in your inspection management system, with location data, asset type, manufacturer details, and any relevant technical documentation attached to each record. This creates the asset inventory that ISO 23456 compliance requires.

The next stage is to build digital checklists that map directly to the inspection requirements in the standard. Each checklist item should specify what is being checked, what constitutes a pass or fail, and what reference material is relevant. Photo evidence fields should be built into the checklist for display state, controller condition, and any faults identified.

Once the checklists are deployed, inspection history accumulates automatically and becomes the basis for your maintenance scheduling and work order management. Faults identified during inspections trigger work orders for repair. Closed work orders are linked back to the originating inspection record. The result is a complete, auditable chain of evidence demonstrating that each sign has been maintained in accordance with the standard.

For organisations with large portfolios of dynamic signs across multiple sites, the ability to manage all inspections centrally and report on compliance status by location, asset type, or fault category is transformative. Rather than depending on paper records filed at individual sites, management can view the current inspection status of every sign in the network from a single dashboard.