Painted markers on mountain paths carry a colour that classifies the route. The scale measures the ground underfoot and the consequence of a slip, not how far or how tiring the walk is.
The colour describes terrain, not effort
An easy classification indicates a broad, well-surfaced path with no significant exposure, where a stumble results in nothing worse than a fall on the path itself.
The middle grade signals narrower ground, possible short steep sections and passages where a slip could carry a walker off the path.
The hardest grade covers routes with sustained exposure, rock steps requiring hands, and occasionally short secured sections, where a fall would have serious consequences.
Distance and ascent are stated separately
Because the colour says nothing about length, signs give walking times rather than kilometres, since time reflects terrain far better than distance does.
A long, easy valley path can demand more endurance than a short, difficult ridge, and the two are described by different parts of the sign.
Reading both together is what produces a realistic plan, and using only the colour is the most common way walkers misjudge a day.
Systems differ between countries and regions
Neighbouring countries developed their own colour conventions, and the same colour can sit at a different point on each scale.
Some regions use a two-colour bar with a white stripe, others use numbers or letters, and a few combine both on the same trail network.
Crossing a border on foot can therefore change the meaning of the paint without changing the difficulty of the ground.
Markers are maintained by volunteers
Waymarking on most networks is done by alpine clubs and local associations, with sections adopted by individuals who repaint and repair on a schedule.
Condition therefore varies. A well-maintained section may be marked every few minutes, while a remote one can leave long gaps between visible marks.
Damage from rockfall, weather and construction is reported through the same voluntary structures, which is why condition notices at trailheads are worth reading.
What the grade assumes about the walker
Classifications assume dry conditions and daylight. Wet rock, fresh snow or fading light can raise the effective difficulty by a full grade.
They also assume appropriate footwear and a head for heights, neither of which the sign can verify, and both of which determine how the route actually feels.
Turning back remains the correct response to an unexpected section, and on a graded network the point of retreat is usually clearly marked.