The NFL often promotes football as a bad weather sport. It got its share early Sunday in Philadelphia, Baltimore, Washington and Pittsburgh.
Blowing snow made traction and visibility difficult for Lions at Eagles, Vikings at Redskins, Chiefs at Redskins, and Dolphins at Steelers.
Detroit running back Reggie Bush injured himself on the slippery field at the Linc in warmups and was not playing. Vikings running back Adrian Peterson left the field in Baltimore with an ankle injury.
The snow so obscured the yard markers it was nearly impossible for fans to tell exactly where the ball was at all four stadiums. Televising networks superimposed the yard lines for viewers at home.
Small tractors with plows, and workers with shovels tried to clear the snow in Baltimore, to no avail. Workers used hand-held snow blowers in Philadelphia, with little effect.