The lots along the Interstate 255 corridor have to be open before the first shift arrives, which puts the work somewhere in the small hours. Custom Pool LLC plows those and the driveways too, running the pavement clear, hitting the entrances with salt, and coming back through when the wind fills a lane back in. Winter on this bottomland is less about depth than about timing — three inches at the wrong hour matters more than eight on a Saturday. The reward is watching cars turn in at daybreak without slowing down. Centreville, Cahokia Heights, Sauget and the neighboring towns are all inside the night's work.