Pile driver seen and felt from car

Waiting at a left exit off Highway 91 south, I needed a green light to turn onto 72nd. Across the freeway, a pile driver was pounding posts into the earth. Each time the piston hit, the hollow whump caused the car to shake. Years ago in the old gravel Scott Road parking lot, I first felt the vibration of a pile driver. Then too it seemed an implacable attack by rough humans on Mother Earth.