How many lanes does the Southern Expressway have?

What strip or barrier between opposing lanes of traffic does an expressway have?

• Answer:

  In the U.S. this type of road may be called a divided highway and has a median between the traffic directions. With few exceptions, all roads in the federally funded Interstate Highway System are fully-controlled access divided highways known as freeways. A broader definition, expressways, includes both freeways and partial limited-access divided highways, and "expressway" is often used specifically to refer to the latter.