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Guest Speaker Lecture Notes

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Week 5 Lecture: Congestion
Class discussion:
Sprawl congestion
Excessive traffic into the core
Overloading of infrastructure
Traffic exceeds the design limitations
Sarzynski paper:
Explores 7 aspects of land use in 1990 and 3 traffic congestion outcomes in 2000 for
50 urban areas
oIs the difference in congestion accountable for differences to do with
Finds density/continuity affects roadway ADT/lane and delay per capita; housing
centrality affects delay per capita; and housing-job proximity inversely affects
commute time
oIf you build more housing closer to work, commute time will go down
Only the last result corresponds to the conventional wisdom that more compact
metropolitan land use patterns reduce traffic congestion
Hypothesizes structural model
oTake 50 cities and take each city as an experiment and then observe traffic
flow patterns
Estimates a reduced form equation for congestion
Type of Study:
Empirical study of 50 selected US MSAs
Observation is a city (EUA) which is MSA minus undevelopable area and land with
little economic attachment to core
Regionally stratified
Proportional random sample within each region
Congestion and its causes:
Congestion getting worse over time
Congestion worse in larger cities
Congestion worsens with income level
Road and public transit capacity
Land use
Authors conclusions:
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