Topic 2 – Transportation Systems and Networks
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Transcript of Topic 2 – Transportation Systems and Networks
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GEOG 80 – Transport GeographyProfessor: Dr. Jean-Paul Rodrigue
Topic 2 – Transportation Systems and Networks
A. Transportation and Commercial GeographyB. Transport CostsC. Transportation NetworksD. Transportation Supply and Demand
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C – Transportation Networks
■ 1. Transport Networks■ 2. The Topology and Typology of Networks■ 3. Networks and Space
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1. Transport Networks
■ Transport network• Framework of routes between locations:
• A permanent track (e.g. roads, rail and canals).• A scheduled service (e.g. airline, transit, train).
• Various types of links between points along which movement can take place.
• Creates accessibility.■ Network structure• Ranges from centripetal to centrifugal.• Express inequalities between places.• Express transport rates.• Integration processes impacted on the structure and flows of
transportation networks.
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Centrifugal and Centripetal Networks
Centrifugal Centripetal
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Network Structures
Centralized Decentralized Distributed
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Transport Hub
Point-to-Point Hub-and-Spoke
Hub
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Cost, Revenue and Level of Network Coverage
5
37
410
Cost: 10Revenue: 15Benefit: 5
A
Cost: 12Revenue: 18Benefit: 6
B
Cost: 14Revenue: 25Benefit: 11
C
Cost: 19Revenue: 29Benefit: 10
D
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Impacts of Integration Processes on Networks and FlowsN
etw
ork
Flow
sBefore Integration After Integration
International border
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2. The Topology and Typology of Networks
■ Topology• The arrangement and connectivity of a network.• Each network has a specific topology.
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Topology of a Network
Node
Link
Unidirectional linkBi-directional link
Entry and exitExitEntry
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Types of Network Topology
Mesh Hub-and-Spoke
Linear Tree
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Network Strategies to Service a Set of Locations
A B C
D E F
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2. The Topology and Typology of Networks
■ Mode of territorial occupation• Clearly defined and delimited:
• Strictly reserved space for transport infrastructure.• Ownership can also be clearly established.• Major examples include road, canal and railway networks.
• Vaguely defined and delimited:• Space may be shared with other modes.• Not the object of any particular ownership, only rights of passage.• Examples include air and maritime transportation networks.
• Without definition:• Space has no tangible meaning, except for the distance it imposes.• Little control and ownership are possible.• Agreements must be reached for common usage.• Examples are radio, television and cellular networks.
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Mode of Territorial Occupation by Transport Networks
Clearly defined Vaguely defined Without definition
RoadRail Air corridor
Maritime corridor Cellular coverage
Overlap
“No service”
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3. Networks and Space
■ Transportation networks and space• Territorial organization of economic activities.• Efforts incurred to overcome distance.• Measured in absolute or relative terms• Related to continuity, topographic space and spatial control.• The territory is a topological space having two or three
dimensions, depending on the transport mode considered.• Flows and infrastructures are linear; having one dimension.
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Transport Networks and Space
Transport Network
Space
Accessibility
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Absolute and Relative Distance in a Network
10 km 30 minutes
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3. Networks and Space
■ Spatial continuity• Ubiquity:
• The possibility to reach any location from any other location. • Fractionalization:
• The possibility for a traveler or an unit of freight to be transported without depending on a group.
• Instantaneous:• The possibility to undertake transportation at the desired moment.
■ Topographic space• Not a continuous space.• Variety of physical features.• Level of influence on the structure of transport networks:
• Depends on the mode.
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Networks and Spatial Continuity
A B
C
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3. Networks and Space
■ Tool for spatial control• Roman and Chinese empires relied on transportation networks to
control their respective territories.• During the colonial era, maritime networks became a significant
tool of trade, exploitation and political control.• In the 19th century, transportation networks also became a tool
of nation building and political control.• In the 20th century, road and highways systems were built to
reinforce this purpose.• For the early 21st century, telecommunication networks have
become means of spatial cohesion and interactions.
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D – Transportation Supply and Demand
■ 1. Context■ 2. Supply and Demand Functions■ 3. Supply / Demand Relationships
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1. Context
■ Transport supply• The capacity of infrastructures and transport modes.• Over a geographically defined transport system and for a specific
period of time.• Expressed in terms of infrastructures, services and networks.• Quantification:
• Per unit of time and space.• Number of passengers.• Volume (for liquids or containerized traffic).• Mass (for freight).
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1. Context
■ Transport demand• Expression of the transport needs of a territory:
• Generated by the economy.• Composed persons, institutions and industries.• Generates movements of people and freight
• Those needs can be satisfied, fully, partially or not at all.• Quantification:
• Number of people, volume, or tons per unit of time and space. ■ Ton-km and Passenger-km• Measures expressing the realized transport demand.• Compares a transported quantity with a distance.
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Ton-Miles of Freight Transported within the United States, 1975-2000 (millions)
0
500,000
1,000,000
1,500,000
2,000,000
2,500,000
3,000,000
3,500,000
4,000,000
1975 1980 1985 1990 1995 2000
AirWaterPilelinesTruckRail
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Passenger-Miles Transported within the United States, 1975-2000 (millions)
0
500,000
1,000,000
1,500,000
2,000,000
2,500,000
3,000,000
3,500,000
1975 1980 1985 1990 1995 2000
RailUrban TransitBusCarAir
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Share of Total Domestic Freight Activity by Mode, G7 Countries, 1996
0102030405060708090
100
Canada France Germany Italy Japan UnitedKingdom
UnitedStates
% o
f tot
al d
omes
tic m
etric
ton-
km
RoadRailOil PipelineWaterAir
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Growth Factors in Transport Demand
Quan
tity
of P
asse
nger
s or
Fre
ight
Average Distance
Growth in production and consumption
Income growth
Industrial relocationEconomic specialization
Suburbanization
Passenger or ton-kms
KM
PassengersFreight
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2. Supply and Demand Functions
■ Transport supply• Functions representing what are the main variables influencing
the capacity of transport systems.• Variables are different for each mode.• Road, rail and telecommunications:
• Dependent on the capacity of the routes and the vehicles.• Air and maritime transportation:
• Influenced by the capacity of the terminals.• Transport of people and freight:
• Expressed in number of vehicles, people or tons over a time period.• The supply of one mode influences the supply of others.• Dependent of the capacity of intermodal infrastructures.
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Major Supply Variables for Transportation Modes
Road Rail Air Maritime•Lanes•Width•Speed limit
•Parking
•Speed•Passengers•Tonnage
Atmospheric Conditions
•Tracks•Grade
•Yards•Transshipment
•Speed•Passengers•Tonnage
•Corridors
•Speed•Passengers•Tonnage
•Runways•Dockways
•Canals•Locks
•Docks•Transshipment
•Speed•Tonnage
Rout
esTe
rmin
als
Vehi
cles
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2. Supply and Demand Functions
■ Transport demand• Related to economic and social activity patterns.• Stable and recurrent; allows the planning of services.• Unstable and uncertain; difficult to offer an adequate level of
service. • Passengers:
• Function of demographic attributes of the population such as income, age, standard of living, race and sex, as well as modal preferences.
• Freight:• Function of economic activities (GDP, commercial surface, number of
tons of ore extracted, etc.) and of modal preferences. • Information:
• Population (telephone calls) and the volume of financial activities (stock exchange).
• Standard of living and education levels.
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3. Supply / Demand Relationships
■ Transport supply and demand interactions• Supply curve:
• Quantity of transport services offered according to price.• The higher the price, the more suppliers are willing to offer a transport
service.• Demand curve:
• Quantity of transport services consumed according to price.• The higher the price, the less users are willing to consume that service.
• Equilibrium price:• Supply and demand interact until an equilibrium is reached.• Quantity of transportation the market is willing to use at a given price.• Quantity being supplied.
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Classic Transport Demand / Supply Function
Traffic
CostDemand Supply
T1
C1
D
S1S2
C2
T2
1212CCTTElasticity
Equilibrium
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2. Supply and Demand Functions
■ Considerations• Entry costs:
• High in some sectors (maritime, rail and air). Oligopolisitc.• Low in other (trucking).
• Public sector:• High level of public involvement. • Provision of transport infrastructures.• Transport costs are partially subsidized.• Government control (and direct ownership).
• Elasticity.• Variation of demand in response to a variation of cost.• Transport demand has a tendency to be inelastic.• Commuting: inelastic in terms of costs but elastic in terms of time.• Freight: inelastic.• Air transportation: elastic (tourism).
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Transport Elasticity by Activity
Traffic
Cost
100%
0%
Emergency
Commuting
Major Purchase
Special Event
Social Activities
Recreation
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T>A
T<A
Transport Supply, Demand and Travel Time
Transport supply (A)
Transport Demand (T)
Time of the Day
Trav
el ti
me
Morningpeak
Afternoonpeak
Traf
fic