**** is closer to "main street" (of a tourist spot, downtown, etc.). It has a lot of shops, and it is typically not longer than a few kilometers. You can find many pedestrians on an . Typical examples include Champs-Élysées and Broadway.
**** refers to roads that connect major locations and are important in terms of transporting people and goods. The roadside of a does not have to be commercially developed. Although there is no particular strict legal criterion, it at least includes highways, and it also includes smaller roads as long as they are recognized and used by most people living in a city. One typical example in Japan is (video), a 52 km road running through peripheral areas of Tokyo.