6.1 – The Function of Transport Terminals

Authors:  Dr. Jean-Paul Rodrigue and Dr. Brian Slack

A terminal is a facility where passengers and freight are assembled or dispersed during transportation.

1. Transport Terminals

Passengers and freight cannot travel individually but in groups or batches. Passengers must go to bus terminals and airports first, where they are “assembled” into busloads or planeloads to reach their final destinations, where they are dispersed. Freight must be consolidated at a distribution center, a port, or a rail yard before shipment. Terminals may also be points of interchange involving the same transport mode. Thus, a passenger wishing to travel by train from Paris to Rotterdam may have to change trains in Brussels, or an air passenger wishing to fly between Montreal and Los Angeles may have to change planes in Toronto. Terminals may also be interchange points between different modes of transportation and their respective networks. Goods being shipped from the American Mid-West to the Ruhr in Germany may travel by rail from Cincinnati to the port of New York, put on a ship to Rotterdam, and then placed on a barge for delivery to Duisburg. Therefore, transport terminals are central and intermediate locations for the mobility of passengers and freight.

Terminal. Any location where freight and passengers either originate, terminate, or are handled in the transportation process. Terminals are central and intermediate locations in the mobility of passengers and freight. They often require specific facilities and equipment to accommodate the traffic they handle.

Terminals may be interchange points within the same modal system, ensuring the continuity of transport flows. This is particularly true for air and port operations with hubs connecting parts of the network. Terminals are also critical points of transfer between modes. Buses and cars deliver people to airports, trucks haul freight to rail terminals, and rail brings freight to docks for loading on ships. One core attribute of transport terminals is their convergence function. They are obligatory points of passage, capitalizing on their geographical location, which is generally intermediate to commercial flows. Thus, transport terminals are created by centrality or intermediacy processes involving the locations they are connected to.

The importance of a transport terminal is often a function of its size. Large transport terminals, particularly ports and airports, confer the status of gateway or hub to their location since they become obligatory points of transit between different segments of the global transport system. Containerization has favored the emergence of a hierarchy of terminals fulfilling different functions and added value, from the mega-gateway coordinating the flows of a large market area to a small rail yard or truck depot servicing a local market. The same observation applies to passenger transport, where a specific hierarchy of terminals is evident. At the top are large hub airports located in global cities, connecting continents, and at the bottom are small local airports with limited daily services to a few destinations.

2. Importance and Performance

Three major attributes are linked with the importance and the performance of transport terminals:

  • Location. The major locational factor of a transport terminal is obviously to serve a large concentration of economic activities, representing a terminal’s market area. Specific terminals have specific locational constraints, such as port and airport sites. The former requires a suitable coastline and nautical profile, while the latter requires a large footprint of open flat land. New transport terminals tend to be located outside central areas to avoid high land costs and congestion and find available land.
  • Accessibility. Accessibility to other terminals (at the local, regional, and global scale) and how well the terminal is linked to the regional transport system are of importance. For instance, a maritime terminal has little relevance if it is poorly connected to its market area through a high-capacity inland transport system (rail, road, or barge).
  • Infrastructure. The primary function of a terminal is to handle and transship freight or passengers since modes are physically separated. Modern terminal infrastructures require massive investments and are among the largest structures ever built. Airports, ports, and distribution centers are visible on remote sensing images. Terminals have a nominal capacity, related to the amount of land they occupy and their technological, labor, and managerial intensity. Infrastructure considerations are essential as they must accommodate current traffic and anticipate future trends along with technological and logistical changes. A utilization rate of 75 to 80% of design capacity is considered to be optimal since, above this level, congestion starts to rise, undermining the reliability of terminal operations. A terminal rarely has a consistent utilization, often characterized by periods of high and low activity (daily, weekly, monthly).

The time a conveyance (bus, truck, train, or ship) is allowed to load or unload passengers or freight at a terminal is usually defined as dwell time. For passenger terminals, travelers expect the lowest dwell time possible. The situation is more complex for freight terminals as dwell time refers to when cargo stays in a terminal yard or storage area while waiting to be loaded. Dwell time can be operational, which reflects the performance of terminal infrastructures and management, including the scheduling and availability of transport services. It can also be transactional, usually linked with the performance of clearance procedures (such as checking in and customs). Finally, dwell time can be storage related, implying that the cargo owner or the carrier deliberately leaves the cargo at the terminal as part of a transport or supply chain management strategy. Intermodalism has incited new relations between transport terminals, becoming nodes in integrated transport chains. This is particularly the case between port, rail, and barge terminals. New forms of integration are also emerging, such as between ports and airports.

3. Passenger Terminals

With one exception, passenger terminals require relatively little specific equipment. Individual mobility is how passengers access buses, ferries, or trains. Indeed, services such as ticketing, shelter, food, and security are required, but the layouts and activities taking place in passenger terminals tend to be simple. They may appear congested and chaotic during their peak daily use. Still, the flow of people can be managed successfully with good design of platforms and access points and with appropriate scheduling of arrivals and departures. The amount of time passengers spend in such terminals tends to be brief. As a result, bus terminals and railway stations tend to be made up of simple components, from ticket offices and waiting areas, with retailing catering to this transient mobility (fast-food restaurants, convenience stores).

Airports are of a completely different order. They are among the most complex of terminals. Moving people through an airport has become a very significant problem, not least because of security concerns. Passengers may spend several hours transiting, with check-in and security checks on departure and baggage pickup and, in many cases, customs and immigration on arrival. Planes may be delayed for many reasons, implying complex management of gates and scheduling of flights. The result is that a wide range of services has to be provided for passengers not directly related to the transfer function, including restaurants, bars, stores, and hotels, in addition to the activities directly related to operations such as check-in halls, passenger loading ramps, and baggage handling facilities. At the same time, airports must provide for the specific needs of the aircraft, such as runways, fueling, maintenance facilities, fire protection, and air traffic control.

Measurement of activities in passenger terminals is generally straightforward. The most common indicator is the number of passengers handled, sometimes differentiated according to arrivals and departures. Transfer passengers are counted in the airport totals even though they do not originate there, so airports that serve as major transfer facilities inevitably record high passenger totals. This is evident in airports such as Atlanta, Chicago, and Dubai, where in-transit passengers account for over 50% of the total passenger movements. High transfer passenger activity has been enhanced by the actions of many of the leading airlines adopting hub and spoke networks. This results in many passengers being forced to change planes at hub airports. By selecting certain airports as hubs, the carriers can dominate activity at those airports, thereby controlling most landing and departure slots and the best gate locations, thus fending off rival airlines. In this way, they can extract monopoly profits.

A further measure of airport activity is the number of aircraft movements, a figure that must be used with some caution because it pays no regard to the capacity of planes. Both a 50-seat regional jet and a 300-seat wide-body aircraft count as one movement. High numbers of aircraft movements may thus not be highly correlated with passenger traffic totals. Still, the number of aircraft movements is an important variable as it indicates the level of usage of the runways as aircraft take about the same landing or takeoff capacity, irrespective of their size.

4. Freight terminals

Freight handling requires specific loading and unloading equipment in addition to the facilities needed to accommodate ships, trucks, and trains (berths, loading bays, and freight yards, respectively). A wide range of handling gear and storage is required, which is determined by the types of cargo. Freight transport terminals have a set of characteristics linked with core (terminal operations) and ancillary activities (added value such as distribution). The result is that terminals are differentiated functionally by the mode involved and the commodities transferred. A basic distinction concerns bulk, general cargo, and containers:

  • Bulk refers to goods handled in large quantities that are unpackaged and available in uniform dimensions. Liquid bulk goods include crude oil and refined products that can be handled using pumps to move the product along with hoses and pipes. Relatively limited handling equipment is needed, but significant storage facilities may be required. Dry bulk includes a wide range of products, such as ores, coal, and cereals. More equipment for dry bulk handling is needed, because the material may have to utilize specialized grabs and cranes and conveyor-belt systems. For specific bulk cargoes, some changes in their characteristics may be required to ensure the continuity of the transportation process, such as its load unit or its physical state (from solid to liquid or gas, or any combination).
  • General cargo refers to goods of many shapes, dimensions, and weights, such as machinery, processed materials, and parts. Because the goods are so uneven and irregular, handling is difficult to mechanize. General cargo handling usually requires labor.
  • Containers are standard units that have had a substantial impact on terminal operations. Container terminals have minimal labor requirements and perform a wide variety of intermodal functions. They, however, require a significant amount of storage space, which are simple paved areas where containers can be stacked and retrieved with intermodal equipment (cranes, straddlers, and holsters). Depending on the intermodal function of the container terminal, specialized cranes, such as portainers (container cranes), are required.

A feature of most freight activity is the need for storage. Assembling individual bundles of goods may be time-consuming, and thus some storage may be required. This requires terminals to be equipped with specialized infrastructures such as grain silos, storage tanks, refrigerated warehouses, or space to stockpile, such as for containers or bulk commodities. Because of its large volumes, containerization has forced a significant modal and temporal separation at terminals and the need for a buffer in the form of storage areas. In addition, a variety of transloading activities (transferring cargo from one load unit to another) can take place in the vicinity of terminals, particularly if long-distance inland transportation is involved. Transloading, when suitable, reduces transportation and inventory costs by placing the cargo in the most suitable transportation mode.

Measurement of freight traffic through terminals is more complicated than for passengers. Because freight is so diverse, standard measures of weight and value are difficult to compare and combine. Because bulk cargoes are inevitably weighty, terminals specialized in such cargoes will record higher throughput measured in tons than others more specialized in general cargoes. This is evident in the world’s two leading ports, Singapore and Rotterdam, handling large quantities of petroleum. The reverse may be true if the value of commodities handled is the measure employed. The problem of measurement involving weight or volumes becomes very difficult when many types of freight are handled because one is adding together goods that are inherently unequal. Interpreting the significance of freight traffic totals is thus subject to caution. For container terminals, a common measure of productivity concerns the number of lifts per container gantry crane-hour, which are usually 25-40 moves per hour for quay cranes and 40-60 for rail cranes.

The difficulty of comparing traffic totals of different commodities has led to attempts to weigh cargoes based on some indication of the value-added they contribute to the terminal. The most famous is the “Bremen Rule” developed in 1982 by the port of Bremen and based on a survey of the labor cost incurred in handling one ton of different cargoes. The results found that handling one ton of general cargo equals three tons of dry bulk and 12 tons of liquid bulk. Although this is the most widely used method, other rules have been developed by individual ports, such as the Antwerp and Rotterdam Rules. The “Antwerp Rule” indicates that the highest value-added is fruit handling. Using this benchmark, forest product handling requires 3.0 tons to provide the same value-added as fruit, cars 1.5 tons, containers 7 tons, cereals 12 tons, and crude oil 47 tons. The “Rotterdam Rules” are more recent (2009) and relate to common practices to ensure the transport of freight “door-to-door” with a sea transport leg.

5. Terminal Costs

SInce they jointly perform transfer and consolidation functions, terminals are essential economically because of the costs incurred in carrying out these activities. The traffic they handle is a source of employment and benefits regional economic activities, notably by providing accessibility to suppliers and customers as well as social interactions and leisure for passenger terminals, which have a more relative value. Terminal costs represent an important component of total transport costs. They are fixed costs incurred regardless of the length of the eventual trip and vary significantly between modes. They can be considered as follows:

  • Infrastructure costs. Include construction and maintenance costs of structures such as piers, runways, cranes, and facilities (warehouses, offices, etc.).
  • Transshipment costs. The costs of loading and unloading passengers or freight, mostly related to labor and energy.
  • Management costs. Many terminals are managed by institutions such as port or airport authorities or private companies (e.g. terminal operators), incurring management costs. For instance, ground and air traffic control are necessary for airport operations. Complex terminals have extensive information systems to must be operated and maintained.

Because ships have the largest carrying capacities, they incur the largest terminal costs since loading or unloading a vessel may take many days. Conversely, a truck or a passenger bus can be loaded much more quickly; hence, the terminal costs for road transport are the lowest. Terminal costs play an important role in determining the competitive position between the modes. Because of their high freight terminal costs, ships and rail are generally unsuitable for short-haul trips.

Cost comparisons frequently measure competition between the modes. Efforts to reduce transport costs can be achieved by using more fuel-efficient vehicles, increasing the size of conveyances (economies of scale), and reducing the required labor with automation and information technologies. However, the benefits will not be realized unless terminal costs are reduced. For example, in water transportation, potential economies of scale achieved by ever larger and more fuel-efficient vessels would be negated if it took longer to load and unload the mega-ships.

Significant steps to reduce terminal costs have been taken. These include introducing information management systems that speed up information processing and remove transactional delays. The most significant development has been the mechanization of loading and unloading activities. Mechanization has been facilitated by using units of standard dimensions such as pallets and, most importantly, containers, which have revolutionized terminal operations. Maritime shipping is the mode most affected by high terminal costs. Ships used to spend as much as three weeks in a port undergoing the unloading of inbound cargo and loading of outbound cargo. Ships now spend less than a couple of days for each port call. A Panamax container ship requires approximately 750 workers/hours to be loaded and unloaded. Before containerization, it would have required 24,000 workers/hours to handle the same cargo volume. The rail industry has also benefited from containerization, enabling trains to be assembled in freight yards in a matter of hours instead of days. Many mechanized terminals are being automated, further expanding their productivity and lowering labor costs. Still, automation involves significant capital expenditures and is therefore not applied uniformly.

Reduced terminal costs have had a major impact on transportation and international trade. Not only have they reduced freight rates, thereby reshaping competition between the modes, but they have profoundly affected transport systems. Ships spending far less time in port are able to make many more revenue-generating trips per year. Efficiency in airports, rail facilities, and ports greatly improves the effectiveness of transportation through better asset utilization.

Activities in transport terminals represent not just the transit of passengers and freight but constitute an important economic activity. Employment in various terminal operations represents an advantage to the local economy. Dockers, baggage handlers, crane operators, and air traffic controllers are an example of jobs generated directly by terminals. In addition, a wide range of ancillary activities are linked to transportation activities at the terminals. These include the carriers (airlines, shipping lines) and intermediate agents (customs brokers, freight forwarders) required to carry out transport operations at the terminal. It is no accident that nodes that include a major airport, port, or rail terminal are also important economic poles. Terminals and related activities are increasingly seen as agents of added value within supply chains.

Related Topics


  • Blow, C. (2005) Transport Terminals and Modal Interchanges, Oxford: Architectural Press.
  • Fleming, D.K. and Y. Hayuth (1994) “Spatial characteristics of transportation hubs: centrality and intermediacy”, Journal of Transport Geography, 2 (1): 3-18.
  • McCalla, R.J., Slack, B. & Comtois, C. (2001) “Intermodal freight terminals: locality and industrial linkages”, Canadian Geographer 45(3): pp. 404-413.