Presentation on theme: "GEOG 80 – Transport Geography Professor: Dr. Jean-Paul Rodrigue Topic 6 – Urban Transportation A.Transportation and Urban Form B.Urban Land Use and Transportation."— Presentation transcript:
GEOG 80 – Transport Geography Professor: Dr. Jean-Paul Rodrigue Topic 6 – Urban Transportation A.Transportation and Urban Form B.Urban Land Use and Transportation C.Urban Mobility D.Urban Transport Problems
A – Transportation and Urban Form ■1. Elements of the Urban Form ■2. Evolution of Transportation and Urban Form ■3. The Spatial Imprint of Urban Transportation ■4. Transportation and the Urban Structure
1. Elements of the Urban Form ■Urbanization Dominant trend of economic and social change. Especially in the developing world. Growing size of cities. Increasing proportion of the urbanized population: More than doubled since Nearly 3 billion in 2000, about 47% of the global population. 50 million urbanites each year, roughly a million a week. By 2050, 6.2 billion people, about two thirds of humanity, will be urban residents. Due to demographic growth and rural to urban migration. ■Urban mobility issues Increased proportionally with urbanization.
1. Elements of the Urban Form ■Urban transportation Requirements of collective, individual and freight transportation. Composed of modes, infrastructures and users. Urban transport modes: May complementary to one another or competing. Transit is a urban form of transportation (high ridership and short distances). Urban transport infrastructures: Physical form used by modes. Consume space and structure the city. Urban transport users: Wide variety of socioeconomic conditions. Variety of spatial conditions. Urban transport as a choice or a constraint.
Transportation and Urban Form Transportation Modes Infrastructures Users Urban Form Spatial imprint
1. Elements of the Urban Form ■Collective Transportation (public transit) Provide publicly accessible mobility over specific parts of a city. Benefiting from economies of scale. Tramways, buses, trains, subways and ferryboats. ■Individual Transportation Includes the car, walking, cycling and the motorcycle. People walk to satisfy their basic mobility. ■Freight Transportation Cities are dominant production and consumption centers. Activities are accompanied by large movements of freight. Delivery trucks converging to industries, warehouses and retail activities. Major terminals.
1. Elements of the Urban Form ■Density issues Modern cities: Inherited an urban form created in the past. Can be monocentric or polycentric (more common). Movements are organized or disorganized. European, Japanese and Chinese: Tend to be monocentric. Movements tend to be organized. 30 to 60% of all trips by walking and cycling. Australian and American cities: Built recently and encourages automobile dependency. Tend to be polycentric. Movements tend to be disorganized.
Possible Urban Movement Patterns Monocentric Polycentric Organized Disorganized
2. Evolution of Transportation and Urban Form ■Evolution of transportation Led to a change in most urban forms. New central areas expressing new urban activities (suburbs). Central business district (CBD): Once the primary destination of commuters and serviced by public transportation. Challenged by changing manufacturing, retailing and management practices. Emergence of sub-centers in the periphery. Manufacturing: Traditional manufacturing depended on centralized workplaces and transportation. Technology has rendered modern industry more flexible.
One Hour Commuting According to Different Urban Transportation Modes Streetcar line Freeway Walking Streetcar Cycling Automobile Automobile with freeways 10 km
A BC Core activities Central activities Peripheral activities Evolution of the Spatial Structure of a City Central area Major transport axis
2. Evolution of Transportation and Urban Form ■Contemporary changes Dispersed urban land development patterns: Abundant land, low transportation costs, tertiary industries. Strong relationship between urban density and car use. Faster growth rate of built areas than population growth. Decentralization of activities: Commuter journeys have remained relatively similar in duration. Commuting tends to be longer and made by privately owned cars rather than by public transportation. Most transit and road systems were developed to facilitate suburb-to-city, rather than suburb-to-suburb, commuting. Suburban highways are often as congested as urban highways.
2. Evolution of Transportation and Urban Form ■Constance in commuting time Most people travel less than 30 minutes in order to get to work. People are spending about 1.2 hours per day commuting. Different transport technologies are associated with different travel speeds and capacity. Cities that rely primarily on non-motorized transport tend to be different than auto-dependent cities. The United States has the lowest average commuting time in the world, around 25 minutes in 1990.
Average Journey to Work Travel Time, 1990
3. The Spatial Imprint of Urban Transportation ■Land for transportation Pre-automobile era: About 10% of the land of a city was devoted to transportation. A growing share of urban areas is allocated to circulation. Variations of the spatial imprint of urban transportation: Between different cities. Between different parts of a city (central and peripheral areas). Private car: Requires space to move around (roads). Spends 98% of its existence stationary in a parking space. Consumes a significant amount of urban space. 10% of the arable land of the United States allocated for the car.
3. The Spatial Imprint of Urban Transportation ■Components of the spatial imprint of urban transportation Pedestrian areas: Amount of space devoted to walking. Space is often shared with roads as sidewalks may use between 10% and 20% of a road's right of way. In central areas, pedestrian areas tend to use a greater share of the right of way (whole areas may be reserved only for pedestrians). Most of pedestrian areas are servicing access to parked automobiles. Roads and parking areas: Amount of space devoted to road transportation, which has two states of activity; moving or parked On average 30% of the urban surface is devoted to roads. Another 20% is required for off-street parking For each car there is about 2 off-street and 2 on-street parking spaces. Roads and parking lots: between 30 to 60% of the total urban surface.
Land Area Consumed by the Car in Selected Countries, 1999
Urban Spatial Structure, Hempstead, Long Island, New York Road (11.9%) Parking (21.8%) Building (5.3%) Other (61.0%)
3. The Spatial Imprint of Urban Transportation Cycling areas: In a disorganized form, cycling simply share access to road space. Many attempts to create a space specific to the circulation of bicycles in urban areas, namely with reserved lanes and parking facilities. Transit systems: Many transit systems, such as buses and tramways, are sharing road areas, which often impairs their efficiency. Subways and rail have their own infrastructures and their own areas. Creation of road lanes reserved to buses. Transport terminals: Amount of space devoted to terminal facilities such as ports, airports, railyards and distribution centers. Globalization has increased the amount of people and freight circulation and the amount of urban space required to support those activities. Many major terminals are located in the peripheral areas of cities, which are the only locations where sufficient amounts of land is available.
Pedestrian, Cycling and Road Spaces, Amsterdam, Netherlands
RoadHighwayActivity center Transit line I II III IV
4. Transportation and the Urban Structure ■Type I - Completely Motorized Network Car-dependent city with a limited centrality: Massive network of high capacity highways. Large parking lots. Low to average land use densities. Public transit is having a residual function. Relationship between commercial / industrial / residential space and parking space. Secondary road converges at highways, along which small centers are located, notably nearby interchanges. Examples: Cities where urban growth occurred in the second half of the twentieth century: Los Angeles, Phoenix, Denver and Dallas.
4. Transportation and the Urban Structure ■Type II - Weak Center Average land use densities and a concentric pattern. CBD offers slightly more jobs than it is possible to move by car. Under-used public transit system: Unprofitable in most instances and thus requires subsidies. Impossible to serve all the territory with the transit system. Ring roads: Emergence a set of small centers in the periphery. Convergence of radial lines, some of them effectively competing with the downtown area for the location of economic activities. Examples: Older cities that emerged if the first half of the twentieth century: Melbourne, San Francisco, Boston, Chicago and Montreal.
The Rationale of a Ring Road Secondary Center City Center Avoiding the congested central area Structuring Suburban development Spatial StructureAccessibility AB A to B = 30 AB A to B = 20
4. Transportation and the Urban Structure ■Type III - Strong Center High land use density: High levels of accessibility to urban transit. Limited needs for highways and parking space in the central area. High capacity and efficient public transit servicing most of the mobility needs. Convergence of radial roads and ring roads: Location of secondary centers, where activities that could no longer able to afford a central location have located. Examples: Cities having important commercial and financial function. Growth in the late 18 th century. Paris, New York, Shanghai, Toronto, Sydney and Hamburg.
4. Transportation and the Urban Structure ■Type IV - Traffic Limitation Average-sized cities having a high land use density that were planned to limit the usage of the car in central zones. Limited driving and parking spaces are available. “Funnel effect“: Public transit is used in the central area. Individual transportation takes a greater importance in the periphery. Keeps cars from the central areas while giving mobility in the suburbs. Examples: Cities having a long planning history aiming to provide mobility by public transit. Historical downtown area protected from heavy circulation. London, Singapore, Hong Kong, Vienna and Stockholm.
B – Urban Land Use and Transportation ■1. The Land Use - Transport System ■2. Urban Land Use Models
1. The Land Use - Transport System ■Urban land use Nature and level of spatial accumulation of activities. Human activities imply a multitude of functions: Production, consumption and distribution. Activity system: Locations and spatial accumulation form land uses. The behavioral patterns of individuals, institutions and firms will have an imprint on land use. ■Land use relationships Land use implies a set of relationships with other land uses. Commercial land use: Relationships with its supplier and customers. Relationships with suppliers: related with movements of freight. Relationships with customers: movements of passengers.
Land UseTransport System Spatial Interactions Accessibility Traffic assignment models Transport capacity Economic base theory Location theory Traffic generation and attraction models Spatial interaction models Distance decay parameters Modal split Infrastructures (supply) Friction of Space Spatial Accumulation (demand) The Transport / Land Use System
2. Urban Land Use Models ■Concentric paradigm Land use of function of distance from a nucleus. ■Sector and nuclei paradigm Influences of transport axis and several nuclei on land use. ■Hybrid paradigm Try to integrate the strengths of each representation. ■Land rent paradigm Land use as a market where different urban activities are competing for land usage at a location.
IV - Working class zone V - Residential zone VI - Commuter zone I - Loop (downtown) II - Factory zone III - Zone of transition LOOP Little Sicily Apartment Houses Bungalow Section Single Family Dwellings Residential District Ghetto Two Plan Area Second Immigrant Settlement Model Chicago, 1920s Black Belt Burgess’ Urban Land Use Model
CBD 2 Wholesale and light manufacturing 3 Low-class residential 4 Middle-class residential 5 High-class residential Heavy manufacturing 7 Sub business district 8 Residential suburb 9 Industrial suburb Sector Nuclei Sector and Nuclei Urban Land Use Models 2
Hybrid Land Use Model Center Industrial / Manufacturing Commercial Residential Transport axis
Rent Distance A- Retailing B- Industry/ commercial C - ApartmentsD - Single houses 1 – Bid rent curves Land Rent and Land Use 2 – Overlay of bid rent curves City limits