Yes, the technical name for that type of road surface is "crushed stone," but most people in the USA call it "gravel." (Technically, "gravel" refers to smooth river stone which is obviously considerably more expensive, used for landscaping but not road building.)

There are several different sizes/grades of crushed limestone, and I'm not sure what the number designations are, but the stones used in most road building out East are typically about 2-3 cm across.