A windrow is the ridge a snow plow leaves along the side of the road. The mystery object was sticking out of one, suggesting the culprit. Bollards are supposed to lie down and get out of the way when vehicles run them over. Jolanta reports that garbage trucks flatten them routinely on pick-up days. She’s seen it on her morning drives to work.
The broken bollard pictured was probably a garbage truck victim before a snow plow uprooted it, base and all. Yup, it was the same poor bollard.