How can I explain my students what is a road, a drive, a highway and a Boulevard. To be honest, I don�t know clearly the difference.

Help me.

Thanks in advance

This is from Wikipedia but as for me it �s not only in north american usage: "In North American usage, highway normally designates a main road for travel between important destinations, such as cities, large towns, and states. Highway designs vary widely and can range from a two-lane road without margins to a multi-lane, grade-separated expressway, freeway, or motorway. However, in practical and useful meaning, a "highway" is a major and significant, well-constucted road that is capable of carrying reasonably-heavy to extremely-heavy traffic."

 

a drive is "a road leading up to a private house" or "a road for vehicles, esp. a scenic one, as in or along a park, or a short one, as an approach to a house".