Sign Types — Danger, Warning, Caution
CSA Z321 (Signs and Symbols for the Workplace) defines three levels of hazard signage used on Ontario construction sites:
Indicates an immediately hazardous situation that WILL result in death or serious injury if not avoided. Red background with white text. Used for: live electrical, fall hazards from heights, confined spaces, structural collapse zones.
Indicates a potentially hazardous situation that COULD result in death or serious injury. Orange background with black text. Used for: heavy equipment operating areas, overhead loads, excavations, radiation.
Indicates a potentially hazardous situation that could result in minor or moderate injury. Yellow background with black text. Used for: slippery surfaces, tripping hazards, low headroom, hot surfaces.
Additionally, NOTICE signs (blue background with white text) are used for non-hazard information — site rules, restricted areas, and administrative instructions.
Site Entrance Board Requirements
Every construction site entrance in Ontario must display the following information, visible to anyone approaching the site:
- ✓ Project information board (O.Reg 213/91, s.6) — see section below
- ✓ PPE requirements — hard hat, safety boots, high-vis vest, eye protection as applicable
- ✓ “Construction Area — Authorized Personnel Only” sign
- ✓ Emergency contact information — site supervisor name and phone number
- ✓ Hazard alerts — any site-specific hazards (asbestos, lead, silica, etc.)
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PPE Requirement Signs
PPE signs use the mandatory action format — blue circular background with white pictogram. Required PPE signs on most Ontario construction sites include:
Hard Hat Required
Safety Boots Required
High-Vis Vest Required
Eye Protection Required
Hearing Protection Required
Fall Protection Required
Hazard-Specific Signs
O.Reg 213/91 and OHSA require specific signage for these construction hazards:
- Excavations over 1.2m deep: Danger sign + barricade at excavation edge
- Asbestos: Warning sign at entrance to work area — “DANGER — ASBESTOS — Cancer and Lung Disease Hazard”
- Confined spaces: Danger sign at each entry point — “DANGER — CONFINED SPACE — Entry by Permit Only”
- Electrical panels: Danger sign — “DANGER — HIGH VOLTAGE” with voltage rating
- Crane/hoist operations: Warning signs for overhead loads, swing radius, and rated capacity
- Silica exposure: Warning sign in areas where concrete cutting, grinding, or drilling creates respirable crystalline silica dust
Placement & Visibility Rules
- Signs must be visible from the normal approach direction
- Minimum letter height proportional to viewing distance — 25 mm per 7.5 m of viewing distance
- Signs must not be obstructed by materials, equipment, or vehicles
- Signs must be maintained in legible condition — replace faded, damaged, or illegible signs
- Signs must be posted before work in the hazard area begins, not after
- Bilingual signs where required by site policy or municipal bylaw
Project Information Board (O.Reg 213/91, Section 6)
Section 6 of O.Reg 213/91 requires a project information board posted in a conspicuous location on every construction project. The board must include:
- ▸Project name and address
- ▸Name, address, and telephone number of the constructor
- ▸Name, address, and telephone number of the owner
- ▸Name and telephone number of the project supervisor
- ▸Registration number of the project (if applicable)
- ▸Date of the most recent Joint Health and Safety Committee meeting
- ▸Names of Joint Health and Safety Committee members (worker and employer representatives)
- ▸Location of the first aid station
- ▸Emergency procedures and evacuation routes
Multilingual Sign Requirements
While Ontario does not legally require multilingual safety signs on all sites, best practice (and many site-specific safety plans) requires signs in languages understood by the workforce. Common additions include French, Portuguese, Italian, Spanish, and Mandarin on Greater Toronto Area sites. CSA Z321 pictograms are language-independent, which is one reason pictogram-based signs are strongly preferred.
Penalties for Non-Compliance
Construction Safety Sign Package
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Construction Site Sign Checklist
- Project information board posted (O.Reg 213/91 s.6)
- PPE requirement signs at every entrance
- Construction Area — Authorized Personnel Only sign
- Emergency contact information posted
- Danger/Warning/Caution signs for all identified hazards
- Confined space entry signs at all confined space access points
- Excavation danger signs and barricades
- Electrical danger signs at all panels and transformers
- All signs legible, not faded or damaged
- Signs posted before work begins in hazard areas
- Fire extinguisher location signs
- First aid station sign
Related Construction & Safety Guides
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Danger, warning, caution, PPE, and project information signs. CSA Z321 compliant. Weather-resistant materials. Ships in 1-2 business days from Ontario.