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Megapolitan is defined as two or more existing metropolitan areas that have grown together to become one huge area and the community boundaries have become blurred.  An example of one such area is from San Diego through Santa Barbara.  When driving from San Diego you will pass through Oceanside, Newport Beach, Long Beach, Los Angeles, Thousand Oaks, Oxnard, Ventura and Santa Barbara.  It is very difficult to tell when you leave one city and enter another.  Robert Lang of Virginia Tech urban studies has theorized that two-thirds of the population will live in 10 of these Megapolitan areas by the year 2040.