Safety signage is a fundamental tool for preventing accidents and protecting workers’ health in hazardous environments. However, frequent errors in how it is applied can undermine the effectiveness of this protective measure. Identifying and correcting these failures is therefore essential to ensure safety in the workplace. Below, we present the six most common mistakes and how to avoid them, as well as the advantages of an integrated approach with technological solutions.
Inappropriate choice of signage
Problem: Many sites use signs that are inappropriate or out of context, resulting in messages that are confusing or irrelevant to workers. This is the case, for example, with generic warning signs in areas with specific risks.
How to avoid it:
Carry out a detailed risk analysis before installing signage, taking into account the characteristics of the environment and the risks associated with each area.
Select signs that meet the specific requirements of the workplace and comply with applicable standards, such as Portuguese Decree-Law No. 141/95 and Ordinance No. 1456-A/95, which set out the minimum requirements for health and safety signage at work.
Use internationally recognised symbols and standardised colour combinations to ensure clarity and understanding, and consider adding explanatory text when necessary.
Efficient document management makes it possible to keep a centralised record of all installed signs, which makes periodic reviews easier and allows updates whenever the environment or legislation changes.
Placement in poorly visible locations
Problem: Signage installed in places that are hard to see is less effective and puts workers at risk of not noticing hazards.
How to avoid it:
Position signs at eye level and in well-lit locations, taking into account the flow of people and the direction of access routes.
Avoid visual obstructions, such as machinery or furniture, and make sure signs are visible from different angles.
Carry out periodic inspections to check that signs remain visible and free of obstacles, and correct any interference immediately.
Technological solutions, such as QR codes or RFID tags built into signage, allow workers to access detailed information about the risk directly on their mobile devices, which makes visual communication more effective.
Lack of regular maintenance
Problem: Damaged, faded or dirty signs lose their ability to convey important messages, putting workers at risk through a lack of adequate information.
How to avoid it:
Establish a preventive maintenance plan with a defined frequency to check the integrity and legibility of signs, taking into account environmental conditions such as exposure to sun and rain.
Immediately replace signs that show visible wear or structural damage.
Clean signs periodically to remove dirt, dust and other debris that may obscure the messages.
Document management platforms can include automatic reminders for inspections and maintenance, so that no detail is forgotten and signage stays in good condition.
Excessive signage
Problem: Installing too many signs in the same area can cause information overload, making it harder to identify priority risks and distracting workers’ attention.
How to avoid it:
Limit signage to what is essential, prioritising the most critical risks and using a visual hierarchy to highlight the most significant hazards.
Combine signs whenever possible, using panels that group several messages clearly and concisely.
Carry out periodic audits to identify and remove redundant signage, ensuring a visually organised environment.
Using document management platforms makes it possible to keep a record of installed signage, which makes it easier to analyse its effectiveness and simplify overloaded areas.
Not considering physical barriers as a complement
Problem: Relying solely on signs to prevent access to dangerous areas may be insufficient, especially in high-risk locations.
How to avoid it:
Integrate signage with physical barriers and access control systems to restrict access more effectively, in line with legal requirements and good practice.
Use turnstiles, gates or automatic barriers to reinforce “Restricted access” warnings.
Combine visual signage with acoustic and light signals to increase risk awareness.
Integration between document management platforms and access control equipment provides a safer and more responsive environment, automating actions based on the compliance status of workers’ documentation.
Lack of worker training
Problem: Even the most effective signage loses its value if workers do not understand its meaning or ignore its messages due to a lack of adequate awareness.
How to avoid it:
Provide ongoing training on the meaning and importance of safety signage, explaining the different types and their purposes.
Reinforce training with practical examples, simulations and interactive activities to consolidate knowledge effectively.
Make educational materials and visual reminders available in common areas, building a comprehensive safety culture.
Training supported by a document management platform makes it possible to confirm that all registered workers have completed the required sessions and makes it easier to track progress.
Colours and shapes: What each sign means
The effectiveness of signage depends on workers quickly recognising the type of message. For this reason, legislation defines colours and shapes for each category:
| Type of sign | Shape | Colour | Example |
|---|---|---|---|
| Prohibition | Circular | Red and white | No smoking |
| Warning | Triangular | Yellow and black | Danger of electrocution |
| Mandatory | Circular | Blue and white | Hard hat must be worn |
| Rescue or first aid | Rectangular or square | Green and white | Emergency exit |
| Firefighting | Rectangular or square | Red and white | Fire extinguisher |
Therefore, mixing colours or creating “custom” signs without following these rules can cause confusion and defeat the purpose.
Practical example: A warehouse signage audit
Imagine a logistics warehouse where, over the years, signs have been put up without any plan. During an audit, the safety team finds faded signs, others hidden behind pallets and forklift areas with no warning at all.
First, the team reviews the risk assessment and defines the signage needed in each area. Next, it removes redundant signs, replaces damaged ones and adds floor markings along traffic routes. Finally, it records each sign on the document management platform, with a photograph and inspection date. In this way, signage becomes systematically controlled and reviewed.
Safety signage checklist
- Is the signage based on the risk assessment for each area?
- Do the signs follow the legal colours and shapes?
- Are they visible, clean and well lit?
- Are exits and firefighting equipment signposted?
- Is there a record of signs and inspections?
- Have workers been informed about what the signs mean?
Temporary signage on sites and during shutdowns
On construction sites and during maintenance shutdowns, risks change every day. For this reason, temporary signage requires special attention. For example, areas with work at height, suspended loads or excavations should be cordoned off and signposted as soon as work begins, and removed when no longer needed. In addition, signage should be included in the site health and safety plan and checked during daily inspections. As a result, workers always find up-to-date information that matches the current risks.
The role of document management
A document management platform makes it easier to control signage. For instance, each sign can have a record with its location, photograph, installation date and inspection history. In addition, the platform can send alerts for upcoming checks and store evidence of worker training. Consequently, the company can demonstrate in any audit that its signage is planned, maintained and understood.
Worker training and information
Signage only works if workers understand it. For this reason, the safety induction of new employees and contractors should include an explanation of the signs used on site, especially emergency signs and those specific to each area. It is also advisable to reinforce this information whenever new signage is installed or risks change. For example, a short safety talk at the start of a shift is enough to introduce a new restricted area. In this way, signage stops being decorative and starts guiding everyone’s behaviour. Finally, evidence of this training should be recorded to demonstrate compliance with information obligations.
Frequently asked questions
Does signage replace other preventive measures?
No. Signage complements measures to eliminate and control risks, but it never replaces them.
Where can I find the signage rules?
In Portuguese Decree-Law No. 141/95 and Ordinance No. 1456-A/95. The Portuguese Authority for Working Conditions (ACT) also provides information on employers’ obligations.
How often should signage be inspected?
A periodic check is recommended, for example monthly, and whenever there are changes on site. On construction sites, the check should be part of daily inspections.
Conclusion
Avoiding mistakes in the use of safety signage requires a proactive and continuous approach. From the right choice of signs to regular maintenance and integration with physical barriers and technological systems, every step contributes to a safer and more efficient working environment. Moreover, combining signage with document management platforms not only optimises compliance but also simplifies the monitoring and updating of signage, improving overall safety management. In short, applying these good practices and adopting suitable digital solutions protects people, the workplace and the company’s resources.
Read also: Types of safety signage on construction sites and The importance of safety signage on construction sites.