I widened our driveway 14.5 inches for about 10 ft then it got progressively wider to the end of about 6 ft. I dug down 7 inches and the footing at the bottom was 18 inches deep. I used 3/8x10ft rebar, drilling’s into the existing driveway and epoxied the rebar in. Ran out of metal wire ties so I welded the rest of the rebar together. It took 2 yards and 3 hours as I miscalculated so the wife took the truck and got another yard. My dad helped me the entire time and my kids did what they could.