ISO 7010:2019 / ISO 3864-1
ISO W082 Crevasses under snow Sign
ISO W082 Crevasses under snow Sign means the presence of crevasses hidden under the snow, deep glacier fissures spanned by wind-blown snow bridges that look continuous and solid yet cannot bear a person. It marks where assessed, controlled terrain ends and unverified glaciated ground begins. It should be used where the cited standard, facility risk assessment, SDS, emergency plan, or written safety procedure requires this hazard or safety message to be communicated.
High-Res Viewer
Reference artwork: Wikimedia Commons · License: CC0
Technical Data
| Legal Standard | ISO 7010:2019 / ISO 3864-1 |
|---|---|
| Color Codes | #FFCC00 / RAL 1003 Signal Yellow |
| Viewing Distance | 50 mm: close equipment or package label; 100 mm: approximately 5 m; 200 mm: approximately 10 m; 300 mm: approximately 15 m; 400 mm: approximately 20 m. |
| Review Status | approved / last reviewed 2026-07-07 |
| Jurisdiction Scope | Global, United States, European Union |
| Keywords | w082, iso 7010, warning, crevasses, under, snow, warn |
Standard Dimensions Table
| Sign Size | Recommended Visibility |
|---|---|
50 mm | close equipment or package label |
100 mm | approximately 5 m |
200 mm | approximately 10 m |
300 mm | approximately 15 m |
400 mm | approximately 20 m. |
Where This Sign Is Used
Glacier ski resorts hang it along the ropes bounding marked pistes, at cable car and lift station exits opening onto glacier plateaus, and at access points used by ski tourers leaving the secured corridor. Viewpoints, glacier walking routes, and ice cave approaches carry it for summer visitors, often with multilingual panels, because the surface on both sides of the barrier looks identical.
In-Depth Guidance
A Warning for Hidden Ground
W082 warns of crevasses under the snow — deep fissures in glacier ice concealed by a snow cover that looks continuous and solid. The pictogram shows a person breaking through a snow surface into a void below. It belongs to the group of mountain and natural-hazard referents added to ISO 7010 by amendment, extending the standard beyond factories and buildings into ski areas, glacier tourism, and alpine terrain.
The hazard is treacherous because the visual evidence is absent by definition. Wind-blown snow bridges span crevasses and can bear their own weight for months while remaining unable to bear a person, and the surface gives no reliable indication of what lies beneath. A fall through a snow bridge typically means a drop of many meters into narrowing ice, with wedging, cold, and difficult extraction compounding the impact injuries.
Where the Sign Is Used
W082 appears at the boundaries where managed terrain meets glaciated terrain: the edges of marked pistes on glacier ski areas, exits from cable car and lift stations that open onto glacier plateaus, viewpoints and walking routes on or beside glaciers, and access points used by ski tourers and mountaineers leaving controlled areas. Operators of glacier resorts in the Alps and similar ranges rope off the secured corridor and hang the triangle along the barrier line.
The sign's message is territorial rather than behavioral: everything inside the marked and controlled area has been assessed; one step beyond the rope has not. That distinction is the operational core of glacier resort safety, because the surface on both sides of the barrier looks identical. W082 also serves summer audiences — hikers on glacier trails and visitors at ice caves — for whom the existence of hidden voids in apparently solid snowfields is genuinely unknown information.
What the Sign Can and Cannot Do
Beyond the barrier, the sign hands responsibility to alpine technique. Travel on crevassed glaciers is a roped-party discipline: harnesses, rope spacing, crevasse rescue equipment, and knowledge of extraction systems, none of which a triangle can supply. W082 at a lift exit is therefore best read as a gate — properly equipped and trained parties pass through; everyone else stays inside the secured area. Resorts often pair it with multilingual text panels and route maps because the consequences of misreading it are severe.
It also pays to distinguish W082 from neighboring winter hazards. Avalanche danger, thin ice over water, and cornice collapse are separate referents and separate signs; a crevasse warning says nothing about snowpack stability. Site operators should match the sign to the assessed hazard rather than posting a generic mountain warning, since visitors calibrate their behavior to the specific danger named.
Frequently Asked Questions
What does the crevasses under snow warning sign mean?
ISO 7010 W082 warns that the snow surface beyond the sign may conceal crevasses — deep cracks in glacier ice bridged over by snow. The surface can look identical to safe ground yet collapse under a person's weight. In practice it marks the limit of secured terrain at glacier ski areas and walking routes: stay inside the marked area unless you are equipped and trained for roped glacier travel.
Why are snow-covered crevasses so dangerous?
Because snow bridges hide them completely. Wind deposits snow across the opening until it spans the gap, and the resulting bridge can look and even feel firm while being far too weak to hold a person. A collapse drops the victim several meters into ice that narrows with depth, so falls combine impact trauma with wedging, rapid cooling, and rescues that require rope systems and often professional teams.
Where are W082 signs posted at ski resorts?
Along the boundary ropes and barriers of glacier ski areas, at lift and cable car exits that open onto glacier terrain, at the edges of marked pistes crossing ice, and on summer glacier trails and viewpoints. The placement logic is a perimeter: the sign marks where patrolled, assessed terrain ends and unassessed crevassed terrain begins, usually accompanied by text panels in several languages.
Does a crevasse warning sign also cover avalanche danger?
No. Crevasses and avalanches are unrelated hazards with separate signs and separate risk assessments. W082 speaks only to hidden voids in glacier ice; snowpack instability on slopes is communicated through avalanche warning signage and the regional bulletin scale. A slope can carry high avalanche danger with no crevasses, and a flat glacier can be riddled with crevasses on a day of minimal avalanche risk.