They are escaping the rain, I have seen them come up on my patio during long periods of heavy rain. These just don’t know they are going to be run over by a vehicle.
i see the same thing here after a rain. One thing I can’t figure out. I have a blue plastic 55 gallon drum cut in half. After each rain storm there are several earthworms in the bottom where rain water has collected. How did they get there? The sides are too slick to climb, and I know the worms did not drop from the sky.
Maybe they did and that might be why they were in the center of the road between the yellow lines.....