Now's a really good time to use wheel chocks.

They're called wheel chocks, and they could save your life.

Basically, all a wheel chock does is prevent a wheel from doing what it does best - rolling.

What a wheel chock does is provide a ramp that the wheel must go up if it wants to continue revolving.

OK, so now you know more than you ever thought you would about wheel chocks.

Lollee brought out wheel chocks and put them under the big tires.

Prior to the use of wheel chocks, several vehicles had fallen overboard.

Reports indicated a wheel chock was left in the wheel well the night before causing the failure to retract.

There was also no wheel chock placed to prevent movement along the gradient of the track.

To use wheel chocks, they must be selected to match the size of the tires on the vehicle, and used in pairs.