Why should sprinklers sprinkle water on rainy days?

Sprinklers are still sprinkling water in rainy days for the following reasons:

On rainy days, the lime soil on the pavement becomes soft after being soaked in rain, and the adhesion is reduced, which is easy to turn into mud. At this time, using the high-pressure water gun on the sprinkler to wash the road surface, it is easy to flush them into the sewer, and completely remove stubborn stains, with twice the result with half the effort. At the same time, it can also eliminate the hidden dangers of vehicle skidding and pedestrian skidding.