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viernes, 20 de noviembre de 2009

Articulo: New Study Quantifies High Personal Costs of Building CA Cities for Cars

Household_transpo_costs_small.jpgClick to enlarge: Annual household transportation costs in the Bay Area.
California residents living in sprawling suburban developments could save billions of dollars every year if they lived in denser, urban zones and along transit corridors, according to a study released today by smart growth and transit advocates TransForm. Analyzing four metropolitan areas--Southern California, the San Francisco Bay Area, San Diego, and Sacramento--Windfall for Allfound that shifting populations in those regions to denser development along transit corridors would save save $31 billion per year, or $3,850 on average per household [Report Summary PDF].

In the Bay Area, where annual car ownership costs on average over $8,000 per person, individuals spend roughly $34 billion every year on personal transportation costs, compared to only $4.6 billion spent by public agencies on transit and roads combined. Households with poor access to public transit not only spend double the amount per year on transportation when compared to those with good access to transit, they produce more than double the amount of CO2, a greenhouse gas.

"The most astounding thing is that agencies pinch their pennies on transit and cut back and we feel like we can't afford not to save that service," said Stuart Cohen, Executive Director of TransForm. "We're already spending more than seven times as much as our agencies spend on public transit and roads just on buying and operating our vehicles."

What's more, the report points out that fuel costs represent a small minority of the cost of owning a car, so the craze for electric and other low-emission vehicles will not dramatically reduce the transportation costs for those living far from their jobs and far from transit. The best solution to combating climate change, the report notes, is to build walkable, vibrant communities where residences are situated close to job centers.

Transpo_CO2_small.jpgClick to enlarge: household CO2 from transportation in the Bay Area.
The report highlights California's Senate Bill 375 (SB 375), which establishes a legislative framework for mandating smart growth along transit corridors, and it argues there are economic incentives for individuals, developers, cities, and regions for limiting the role of the private automobile in transportation spending.

"By reducing public and private transportation costs and increasing revenues to local governments, SB 375 can help put dollars back in the pockets of consumers and local governments," said Cohen.

Windfall for All counters the claim that SB 375 will be too costly to implement during the current economic crisis with several examples of how planning denser cities and offering alternatives to private car travel can save money.

First, in Sacramento, the Sacramento Area Council of Governments (SACOG) created a 2050 development blueprint that forecasts current development patterns and compared them to smart growth patterns. SACOG found that Sacramento would save $9.4 billion in public infrastructure costs (transportation, utilities, water, etc), $655 million in annual residents' fuel costs and $8.4 billion less for land purchases to offset environmental degradation from sprawl. The city would also see a 300 percent increase in public transit use if the city clustered development around transit within an urban growth boundary.

Transpo_Cost_and_CO2_small.jpgBenefits of public transportation for household costs and pollution. Image: TransForm.
Another case study from TransForm's report analyzed the promising results from the University of California San Diego's (UCSD) experiment in promoting non-automobile travel to the campus. Rather than build 10 additional parking facilities that had been planned and using parking revenue from three garages built between 2001 and 2007 at UCSD's La Jolla campus, the university invested in shuttles, expanded routes, discount and free fares on transit, as well as facilities for bicycling and pedestrians, all of which has resulted in a dramatic reduction of solo-driver trips. The alternative transportation measures and the costs savings from not building the new garages were so significant, UCSD has frozen the construction of new garages. The USCD model was successful enough to convince the University of California system to require universities to present a business model analyzing the benefits of transit, ride sharing, and bicycle facilities before building new garages.

In the Bay Area, parking regulations are a significant impediment to dense development. In San Leandro, parking minimums of more than two parking spaces for each new home made dense development a planning impossibility. When San Leandro re-wrote its downtown plan, it rezoned to allow 3,400 new homes, more than seven times the limit under the old zoning laws. The first development in the new Downtown Transit-Oriented Development Strategy, The Alameda, designed by San Francisco Architect David Baker, saves $3.9 million by eliminating a level of parking and produces 30 more affordable units, according to the report.

Based on these and other case studies, Cohen suggested California should consider levying a climate impact fee on gasoline to generate enough money to expand public transit options and expand walkable communities while improving the economy and meeting ambitious greenhouse gas targets.

"Building our communities with the expectation that every driver in a family is going to have to own their own car is part of what is part of what is bankrupting families," said Cohen. "The infrastructure for the... roads and those patterns of growth is part of what is bankrupting our public agencies."

Costs_of_Car_ownership_small.jpg

Windfall for All Critical Recommendations

  • Integrate full economic analysis into planning. The huge dividends from efficient land use become evident once personal costs, not just public budgets, are considered. Without such analysis, we will continue to promote plans and policies that cost too much for families, businesses, and local governments.
  • Provide cities and counties with an infusion of funds to engage the community in planning. The state should make funds available for updating zoning codes and parking policies to make more efficient use of land and resources. Identifying strategies to maintain and expand the number of affordable homes is also critical.
  • Fund cost-effective public transportation. The state needs to provide leadership and restore funds for public transit, as well as make it easier for regions to raise new revenues with climate-impact fees. Economic analysis could determine whether such fees, if spent in ways that promote more efficient communities, can reduce our overall costs.
  • Innovate, evaluate and replicate. There are dozens of innovative strategies – whether an individual program such as car-sharing, or a comprehensive rewards approach such as UC San Diego’s. MTC, the Bay Area’s transportation agency, will soon launch the first “Transportation Climate Action Program.” This program will seed, evaluate and replicate innovative programs. Other regions should follow suit.
  • New development should minimize pollution from new residents – or pay to mitigate it. The San Joaquin Valley is encouraging efficient development from the start. New developments that don’t provide walkable communities with convenient transportation choices must mitigate the costs of the air pollution that will be generated by future residents. The state and regional air districts should encourage this same system for mitigating the costs of greenhouse gases.



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viernes, 6 de noviembre de 2009

Blog: Metrocable: ¿posible solución de transporte?

Metrocable: posible solución de transporte.

En éstos días retomando mis documentos archivados di con un mensaje de un colega sobre los teleféricos en Medellín, Colombia y decidí averiguar de qué se trataba, semejante proyecto de transporte para las montañas habitadas por los mas desaforecidos.

Primero debemos conocer el sitio: la ciudad de Medellín. Esta es la capital del departamento de Antioquia, situada en el noroccidente de Colombia. Cuenta con 2.250.00 habitantes aproximadamente (3.300.000 en el área metropolitana de Medellín), por lo que se convierte en la segunda ciudad de Colombia. Medellín esta conformada por una zona urbana, dividida en 6 zonas y 5 corregimientos que la rodean. Estos últimos que proporcionalmente tiene dos veces la superficie de la zona urbana son habitados por la población con menos recursos.

Mapa de Colombia

Al igual que otras ciudades de América Latina como Caracas, Medellín es una ciudad fundada en un valle que contiene al río Medellín, esta condición de estar “encunada” limita su extensión horizontal.

En cambio ciertas comunas y muchos de los corregimientos están conformados principalmente por asentamientos urbanos informales y espontáneos, éstos se encuentran a lo largo de las laderas que rodean la ciudad formal. Algunas de estas laderas son bastantes escarpadas como son el caso de las comunas Santa Cruz y Popular.

Son precisamente en estas dos comunas de topografía complicada donde la compañía Metro de Medellín implantó una línea adicional en alturas para activar la movilidad en el transporte colectivo de este sector de la ciudad. El proyecto contó con la participación económica de la Alcaldía del Medellín (55%) y de la empresa Metro (45%). Este proyecto esta inscrito en el Proyecto Urbano Integral (PUI) que buscan la recuperación del espacio público para los habitantes de estas zonas tan deprimidas. Esta línea aérea de metro llamada Metrocable, no es pensada como una línea de metro aéreo, puesto que el terreno esta habitado y tiene una topografía bastante difícil. En cambio el Metrocable es más bien un teleférico (en dos tramos: línea K y línea C) que se enlaza con la línea principal del Metro.

Vista aerea

Mas específicamente el metrocable funciona con un sistema tipo “Góndola monocable”. La longitud en la línea mas extensa que pasa por las comunas nombradas (línea K), es de 2072 m, hilando un desnivel de casi 400 m. La velocidad comercial del sistema 5 metros/segundo, por lo que no puede ser considerado como un teleférico turístico, los cuales tienen una velocidad media de 3,5 m/s. Además el metrocable de Medellín es el único unido a un sistema de transporte colectivo en el mundo, transportando 3000 pasajeros/hora aproximadamente.

Metrocable
Metrocable

Este servicio de transporte experimental ha servido para integrar al transporte público a estas comunas que habitualmente se encontraban marginadas y que tenían difícil acceso. Sin embargo, su implantación no data sino del 2004, y después de tres años sigue siendo un sistema nuevo, experimental, innovador; así que nada puede garantizar, por ahora, su viabilidad como medio de transporte masivo frente a otras posibles soluciones de movilidad. Siendo un sistema de costosa implantación y de difícil evolución.

Otros datos técnicos. Número de pilonas de sostenimiento: 20 Diámetro del cable y peso: 51 mm. – alma compacta – 42 toneladas Ancho de la vía: 5.7 m. Área construida total: 10.200 m2 Área total urbanismo: 9.000 m2 Número de cabinas: Se puede operar con 75, 80, 85 y 90 cabinas, con capacidad para 10 usuarios c/u. Distancia entre las cabinas: 60 m. Frecuencia: 12 seg Especificaciones técnicas: Cabinas fabricadas en aluminio y con iluminación interna e intercomunicación

Estacion