When is rain most dangerous?
A)When it begins to rain.Correct
B)When it rains intensely.
C)When it rains after it has snowed.
On the road, residues of dust, pollen, gravel or oil from other vehicles accumulate, which when it starts to rain form an especially slippery sludge. For this reason, rain is more dangerous when the first drops fall than when it has been raining for a while.