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Falling Rock Signs in Canada

Jasper National Park, Alberta, IX.2000;
pict. M. Plessers
HW99, British Columbia, VIII.2000;
pict. D. Young
You probably won't find it along many roads but it is a sign that warns for falling rocks, and more. The artist very carefully depicted both ice- and rockboulders. I count seven of each.

Teachers using this panel as an example are warned: a glacier spitting out exactly the same number of ice blocks and rocks is highly improbable and could put your pupils on the wrong leg.

This sign isn't suitable for class-room use either: alternating boulders and pebbles in the same numbers. Seeing it happen on the road I think I would promptly lose control (of my vehicle - just for clarity).

Compare both signs and observe how the boulders
+ left are in orbit around the imaginary circle
+ right drop to the center of the circle and thus behave closer to what we expect from experience.

 
Glacier Park, British Columbia, 21.V.2006; pict. R. Mason Point Amour, Labrador,
18.VII.2010; pict. Baeten & De Dier
Our latest find is almost identical to the first one from the same province, but regular visitors to this site —keen as they are— will surely immediately spot the peculiarities in the top region. The top of the cliff is smoother and a complementary rock is on its way down. A good start for breaking up the all too artificial alternation of rocks and pebbles.
 

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