My full sized loader backhoe drove over my 3 1/2 inch driveway dozens of times without cracking it. It weighs 14,000 pounds. I had to drive across it to get into my backyard. Of course, I then had to have a full dump truck go across it to get to where I'm building my swimming pool, and that cracked it pretty good. No worries since I plan on removing all of the concrete to build my garage.