econ 135 fall08 lecture7a

econ 135 fall08 lecture7a - Urban Economics Lecture 7 Urban...

Info iconThis preview shows pages 1–7. Sign up to view the full content.

View Full Document Right Arrow Icon
1 Urban Economics Lecture 7 Urban Transportation Start with some facts/history. How does suburbanization of jobs and housing affect commuting? Suburbanization of housing by itself lengthens commuting journey length, since the distance to the CBD is longer. Suburbanization of jobs reduces commuting journey length, since jobs move closer to houses. But when housing and jobs both suburbanize, the increase in commuting journey length is smaller. Commuting journey length still increases, though, because workers commute circumferentially as well as radially.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2 (Cars allow circumferential trips, meaning that they allow firms and HH to locate in places that would be inaccessible by public transport.) When cities suburbanize, the urbanized land area increases faster than the radius. (Example: radius rises from 10 to 12, area rises from 314 to 452 miles squared. So 20% increase in radius implies a 44% increase in area.) This raises commuting journey length.
Background image of page 2
3 Automobile Ownership, Miles of Travel and Road Mileage 1950 1960 1970 1980 1990 2000 % families owning cars .60 .77 .82 .87 .91 .92 Persons/car 3.7 2.9 2.3 1.9 1.9 2.1 Miles of urban travel by car (billions) 184 287 497 671 1410 2068 (in 1995) Urban road miles (000) 323 430 561 624 757 859 Miles of urban travel/miles of road (000) 571 667 886 1075 1863 2407 Number of vehicles (millions) 40 62 89 121 132 133 Pubtrans trips (000,000) 17 9 7 9 9 7.7 in 1995
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
4 Commuting Journey Length 1969 1977 1983 1990 2001 Distance (mi) 8.9 11.0 12.1 Auto 9.4 9.2 9.9 10.4 Bus 8.7 7.2 8.6 9.3 Total 9.9 9.2 9.9 10.6 Time (min) 22 20 17.6 19.0 22.5 Speed (mph) 30 35 32 Most commuters travel by car (77% of central city residents and 93% of suburban residents). This is because they save time commuting by car. The average commuting journey has been increasing in distance and time. Commute Times by Size of City (1990?) Metro area Avg Time Spent Commuting New York 38 minutes Washington DC (2 nd highest) 28.5 49 largest metro areas 22 Typical city of .5 million population 18
Background image of page 4
5 Regression Results Explaining Average Commuting Time, 50 Largest U.S. Metro Areas, 1980 Coefficient (* = stat sig) Mean Value Population (millions) (+) .383* 2.15 Proportion Public transport (+) 20.2* .068 Proportion Af-American (+) 18* .11 Median HH Income (+) .662* 8.8 Proportion Jobs in CBD (+) 4.96* .081 Proportion Moved in last 5 years 6.57* .52 Proportion 2 Worker HH (-) -3.0 (almost stat sig) .42 Intercept 9.75* R squared .86
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
6 Predicted signs are in parentheses. Explain predictions. If the population increases by 1,000,000, avg commuting time rises by only .4 minutes. This suggests that suburbanization of jobs has mainly offset the increase in commuting times that would be expected if housing suburbanized but jobs remained in the center. Public transit:
Background image of page 6
Image of page 7
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 20

econ 135 fall08 lecture7a - Urban Economics Lecture 7 Urban...

This preview shows document pages 1 - 7. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online