I used to use a snow fence to keep the snow of my driveway...had 3 50 foot sections, each about 20 feet apart, and the closest one to the driveway was about 30 feet.
Used the regular green metal garden posts to hold them up and also fastened them every 10 feet or so front and back with oak stakes with wire lines (kind of like tent tie-downs) to keep them from blowing over...
I stopped using them because I work from home and really don't mind doing any extra plowing in the winter. Less work than setting up and taking down the fence...and more fun/w3tcompact/icons/smile.gif