Transportation map


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By examining U.S. metropolitan areas, one can see that highly ecoefficient transportation systems tend to be located in certain regions of the country. So show the geographic patterns in transportation ecoefficiency, I produced a map of U.S. metropolitan areas, categorized by their Transportation Ecoefficiency scores in the year 2000. I designed the he Transportation Ecoefficiency measure for my doctoral dissertation.

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Transportation map

  1. 1. McCreery   Page  1   Urban Transportation Ecoefficiency: Classifying U.S. Metropolitan Areas by Transportation System Features Dr. Anna C. McCreery Ph.D. in Environmental Science (June 2012) Ohio State University    
  2. 2. McCreery   Page  2   This document describes a system used to classify U.S. metropolitan areas according thefeatures that are important for determining the environmental impact of transportation. It detailsthe categories, and provides a map of metropolitan areas based on those categories.Classifying Metropolitan Transportation Systems To compare U.S. metropolitan areas in terms of the environmental impacts oftransportation systems, I have constructed a measure of transportation based on fourcomponents: 1) population density (which affects how far people travel); 2) % of commutersdriving alone to work; 3) % of commuters taking public transit; 4) % of commuters walking orbicycling. For example, a metropolitan area with a more environmentally friendly transportationsystem would hive: higher-than-average population density, a smaller % of commuters drivingalone to work, and a larger % of commuters taking public transit, walking, or bicycling. Basedon an averaged index of these components, I categorized each metropolitan area in my sample. Table 1. Values ranges for categories based on 2000 Transportation Index, for U.S. Metropolitan Statistical Areas (MSAs). The index values are for comparison purposes, and indicate how far the score is from the average. In other words, a higher positive index value indicates that the metropolitan area is above the average, and has a more environmentally friendly transportation system. Transportation Category Index Values # of MSAs % of MSAs Well below average -0.5 and below 7 2.6% A little below average -0.49 to -0.1 100 36.8% Average + or - 0.09 71 26.1% A little above average 0.1 to 0.49 68 25.0% Well above average 0.5 to 1 18 6.6% Very high above average >1 8 2.9%Map of U.S. Metropolitan Areas Using these categories, I produced a map of U.S. metropolitan areas (on the next page).The map shows the geographic distribution of environmentally friendly urban transportation,which is mostly clustered in the Northeast.
  3. 3. McCreery   Page  3   Figure 1. Classification of U.S. Metropolitan Statistical Areas by Transportation Index Category, in 2000.