Intermodal freight transportation utilizes more than one mode of transportation (road, rail, sea, air, etc.) to move goods between an origin and destination. Intermodal passenger transport applies the same concept to moving people. Some modes of transportation have always been intermodal; for example, most major airports have extensive facilities for automobile parking and have good rail or bus connections to the cities nearby. Urban bus systems generally serve train and subway stations and often extend to the local airport. A major goal of modern intermodal passenger transport, at least in developed countries, is to reduce dependence on the automobile as the major mode of ground transportation and increase use of public transport.
Intermodal planners try to encourage automobile commuters to make much of their journey by public transport. One of the more successful ways of doing this is to provide parking places in the suburbs near major highways where commuter can leave their cars for the day and take a train or bus into an urban downtown area.
Another increasingly popular tool for intermodalism is to extend subway and rail service to major urban airports. This provides travelers with an often less expensive and more reliable way to get to their flights than driving, and contending with full up parking, or taking taxis and getting caught in traffic jams on the way to the airport. Many airports now have some mass transit link, including
At the Hong Kong International Airport, ferry services to various piers in the Pearl River Delta is provided. Passengers from Guangdong can use these piers to take a flight at the Airport, without passing through customs and immigration control, effectively like having a transit from one flight to another. The Airport is well-connected with expressways and an Airport Express train service. A seaport and logistics facilities will be added in the near future.
In recent years, an increasing emphasis has been placed on designing facilities that make such transfers easier and more seamless. These are intended to help passengers move from one mode (or form) of transportation to another. An intermodal station may service air, rail, and highway transportation for example.
In some cases, facilities were merged or transferred into a new facility, as at the William F. Walsh Regional Transportation Center in Syracuse, New York or South Station in Boston, Massachusetts. In other cases new facilities, such as the Alewife Station In Cambridge, Massachusetts were built from the start to emphasize intermodalism.
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