(a) (b) (c)
HFN
Figure 4. Effect of plowing and sanding on tire-ice friction 1 Figure 5. Effect of plowing and sanding on tire-snow friction after a
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Figure 3. Road conditions for tests on Feb. 21:
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after high sanding 1
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heavy snowfall 1
HFN
Ice Plowed Snow Medium Plowed
Sanded
over Snow
Low
Sanded
Medium
Sanded
Medium
Sanded
High
Sanded
High
Sanded
120
90
60
30
0
Low
Sanded
120
90
60
30
0
-30
ALBERTA HEAVY Quarter 1 2020 29
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