ISO 7010 · W-series · Warning

W011 Warning; Slippery surface

Our drawing, not ISO’s artwork.

The floor or surface here is slippery: wet, polished or icy.

ISO 7010 reference: W011
Registered title: Warning; Slippery surface ISO Online Browsing Platform, ISO 7010 - W011, Warning; Slippery surface, reference number and registered title
Colour and shape: Yellow triangle with a black border, black symbol: Warning: a hazard is here

What the yellow triangle with a black border means

In HSE’s guidance on the UK Safety Signs and Signals Regulations 1996, a warning sign has a triangular shape Health and Safety Executive (HSE), L64 Safety signs and signals: The Health and Safety (Safety Signs and Signals) Regulations 1996. Guidance on Regulations (third edition), Part 2, warning signs, intrinsic features (a), page 14 and a black pictogram on a yellow background with black edging (the yellow part to take up at least 50% of the area of the sign) Health and Safety Executive (HSE), L64 Safety signs and signals: The Health and Safety (Safety Signs and Signals) Regulations 1996. Guidance on Regulations (third edition), Part 2, warning signs, intrinsic features (b), page 14

Its colour stands for: Warning sign, Be careful; take precautions; examine Health and Safety Executive (HSE), L64 Safety signs and signals: The Health and Safety (Safety Signs and Signals) Regulations 1996. Guidance on Regulations (third edition), Table 1, yellow or amber, meaning or purpose (page 12)

In the UK: HSE L64

L64 does not name this sign. What it says about the whole class applies:

In the US: OSHA

OSHA’s rule below is about the hazard or the equipment, not about the sign itself.

Walking-working surfaces are maintained free of hazards such as sharp or protruding objects, loose boards, corrosion, leaks, spills, snow, and ice. US Occupational Safety and Health Administration (OSHA), 29 CFR 1910.22 Walking-working surfaces: General requirements, 1910.22(a)(3)

Signs people confuse with it, or find beside it

Other warning signs

Sources

ISO 7010 is a paid standard. Its OBP entries are free to view, but they are a script-driven app, so the title and reference number above are copied from the entry's own heading as it lists them (read 2026-09-29), not from the paid text. Other lines in quotation marks are HSE’s or OSHA’s words.

US Occupational Safety and Health Administration (OSHA): 29 CFR 1910.22 Walking-working surfaces: General requirements (current eCFR text). Used here: 1910.22(a)(3). www.osha.gov Checked 2026-09-29.
ISO Online Browsing Platform: ISO 7010 - W011, Warning; Slippery surface (registered safety sign entry). Used here: reference number and registered title. www.iso.org Checked 2026-09-29.
Health and Safety Executive (HSE): L64 Safety signs and signals: The Health and Safety (Safety Signs and Signals) Regulations 1996. Guidance on Regulations (third edition) (published 2015). Used here: Part 2, warning signs, intrinsic features (a), page 14; Part 2, warning signs, intrinsic features (b), page 14; Table 1, yellow or amber, instruction and information (page 12); Table 1, yellow or amber, meaning or purpose (page 12). www.hse.gov.uk Checked 2026-09-29.