There are numerous Driveway Types and Configuration Options
Here is a high and steep driveway in asphalt. The customer is warming it via 2 tire track paths 2' wide, the entire length. This is an economical way to make such a long and dangerous driveway passable. You don't need to heat the entire zone edge to edge to get the result.
Here is a nice gallery of a concrete condo install before and after. You can do edge to edge or any variation that makes sense. You can view the thumbnails or simply click on a thumbnail for a larger images and then view the photos in a larger size.