Transportation geography, also transport geography, is a branch of Economic geography that particularly investigates the movement of and connections between things of interest to people: people themselves, vehicles, commodities, information. Transportation, or more basically, movement, is fundamental to the economic activity of exchange. At the most basic level, humans move and thus interact with each other by walking, but transportation geography typically studies more complex and regional or global systems of transportation that include multiple interconnected modes like public transit, personal cars, bicycles, freight railroads, the Internet, airplanes and more.
Transport and Urban geography are closely intertwined. Cities are very much shaped, indeed created, by the types of exchange and interaction facilitated by movement. Increasingly since the 19th century, transportation has been seen as a way cities, countries or firms compete with each other in a variety of spaces and contexts.
Transportation geography measures the result of human activity between and within locations. It focuses on things such as travel time, routes chosen, modes of transport, cost and resource use. Other topics of interest include topography, safety of vehicles, and energy use within an individual's or group's journey.
The purpose of transportation is to move through space, which is shaped by both cultural and physical constraints such as distance, political boundaries, time, and topography.
In terms of transport modes, the primary forms are air, rail, road, and water. Each one has its own cost associated with speed of movement, as a result of friction and place of origin and destination. For moving large amounts of goods, ships are generally used. Maritime shipping is able to carry more at a cheaper price around the world. For moving people who prefer to minimize travel time, and maximize comfort and convenience, air and road are the most common modes in usage. A railroad is often used to transport goods in areas away from water.
" Transportation modes are an essential component of transport systems since they are the means by which mobility is supported. Geographers consider a wide range of modes that may be grouped into three broad categories based on the medium they exploit: land, water and air. Each mode has its own requirements and features, and is adapted to serve the specific demands of freight and passenger traffic. This gives rise to marked differences in the ways the modes are deployed and used in different parts of the world. Recently, there is a trend towards integrating the modes through intermodality and linking the modes ever more closely into production and distribution activities. At the same time; however, passenger and freight activity is becoming increasingly separated across most modes." 
Road transportation networks are the type of transportation that is connected with movements on constructed roads; carrying people and goods from one place to another by means of lorries, cars, etc.
Water transportation is the slowest form of transportation in the movement of goods and people. Strategic chokepoints around the world have continued to play significant roles in maritime industry.
Problems with transportation geography
Traffic and transportation on existing streets, highways, and rail facilities no longer match demands created by a recent population growth, and new location patterns of economic activity. Besides an increase in population, another problem is vehicles overloading the network of highways and arterial streets. See Traffic congestion, Transportation network, and Population densities
- Economic geography
- Human geography
- Urban geography
- Journal of Transport Geography
- Geographic mobility
- Ribbon development
- Dr. Jean-Paul Rodrigue, Dept. of Economics & Geography, Hofstra University