I will soon be berming up a driveway that is a few hundred feet long off of a county road. My plan is building a road up from the black field topsoil. From there I will lay likely 15' wide geotextile fabric. I would like opinions on what gravel to put on top of the fabric. I am thinking 3" road base for the entire gravel layer. I like how it packs together instead of clean gravel but is that going to be a bad thing? The geotextile fabric can filter water, so maybe the road base on top is a bad idea. I don't need gravel below the fabric correct?

Thanks.