Lowes has 50# blocks of rubber designed for filling cracks in driveways, especially larger cracks. and stays intact for a long time, years.
Simply get a turkey fryer and a Nesco sized pan, break down and melt the rubber to a good flowing temperature. and fill in the cracks using a pouring applicator designed for that. We sealed all large cracks in our 1200' driveway and maybe 1000 square feet of alligator type cracks 6 years ago for about $400 worth of rubber. $70 for a cooker, a used Nesco kettle and a $70 applicator kettle. Can't forget a weedburner for heating the road where tar will be applied.
My wife followed after me with a ice scraper to massage the tar into the fine cracks. After the cracks showed again we went over most cracks again a few weeks ago but it only took and 4 bricks of rubber. i like it.
A contractor did half the cracks across the driveway for $450 6 years ago is why we decided to try it ourselves. It took a day to go over it all again and touch it up nice. Takes a lot less rubber the second time around.