What are the differences in roads, avenues, boulevards, streets, etc?

A boulevard is typically a large main road. In other words, it often has more than just 2 lanes. A boulevard is not going to be a small residential road or a windy 2-lane road through the mountains; it’s going to be a big 4 or 6-lane road that goes through the central part of a city.

The other ones you mentioned don’t really have any “requirements”, but from what I’ve noticed, avenues and streets never dead-end. They almost always go through and they rarely curve or they do not curve much if they do. “Roads” can be absolutely anything, of any length, size, shape, etc.

Other things I’ve noticed: “Ways” tend to be short and they tend to go through; “Lanes” are usually straight, they can either go through or dead-end, “places” are short and dead end”, “courts” dead end, usually in a cul-de-sac, “drives” always curve, etc.

An “avenue” is supposed to be lined with trees.

Street is smallest with least traffic and found in cities. Road is a country street. Avenues are larger than streets, but smaller than Blvds. Boulevards are the largest streets of all, leading to highways, expressways and freeways.

They are all meaningless.

A lot of people have preconceived notions of what names “should” imply. Generally, there is no significance to most street names.

However, some cities and other municipalities have adopted conventions regarding naming of secondary North-South “Streets” and East-West “Avenues”, with “Boulevards”, “Places”, “Circles” and other names (generally not “Roads”) as tertiary roads only, and often not even through ways.