Archive | July, 2012

The Fall and Rise of the I-35W Mississippi River Bridge – Part 7: Replacement

The replacement bridge cost $251 million, funded almost entirely by federal government. We can debate whether the federal government should have paid for it (it was originally built with 90 percent federal contributions, 10 percent state, but matches recently are much more balanced), since most traffic using the Bridge both originated in and is destined […]

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The Fall and Rise of the I-35W Mississippi River Bridge – Part 6: Traffic

Travel behavior changes after network disruption as well as after the replacement of disrupted links are not well-understood. The first table shows the number of river crossing trips by type of facility before and after the collapse and the reopening. We discover 46,000 lost trips daily after the collapse (nearly a third of what the […]

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The Fall and Rise of the I-35W Mississippi River Bridge – Part 5: Economics

At the request of Mn/DOT, shortly after the collapse, Feng Xie and I estimated the Twin Cities 7-county region daily vehicle hours of travel with and without the Bridge using a planning model under two assumptions. The first kept the trip table fixed. This means that people did not change the number of trips, or […]

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The Fall and Rise of the I-35W Mississippi River Bridge – Part 4: Politics

Some will say the Bridge collapse was not about money. Throwing money at the Bridge would not have kept it from falling. Others note money could have bought: more inspections, a structural (e.g. finite-element) model of the Bridge, better, faster repairs, the ability to replace the Bridge sooner. Money could have been spent more wisely. […]

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The Fall and Rise of the I-35W Mississippi River Bridge – Part 3: Communication

The I-35W Bridge collapse occurred before the advent of Twitter, when there were only 50 million users of Facebook (as February 2012 there were 845 million users, and growth in user numbers seems to be leveling off). [I joined Facebook on November 13, 2004, so they tell me, when Facebook had fewer than 1 million […]

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Form-Based Code a Tool for Successful TOD

When it opened in 2010, Walnut Creek Apartments provided 422 apartment units and 35,000 square feet of street-facing retail immediately adjacent to the Pleasant Hill/Contra Costa Centre Station of the BART system, located in Walnut Creek, California, in the bay area east of San Francisco. What isn’t immediately evident when visiting this attractive transit-oriented development […]

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The Fall and Rise of the I-35W Mississippi River Bridge – Part 2: Structure

Bridges are designed to overcome gravity. They take travelers over a trench, river, or chasm of some kind to reduce the costs of travel. In their absence, travelers would need to descend, and ford a river, take a ferry, or make some other less convenient accommodation. Bridges are networks, sometimes simple, sometimes complex, for transmitting […]

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Design Contest for a Streets.MN Logo!

Streets.MN is looking for a new logo! In the seventh months since Streets.MN launched, our readership has grown steadily. While we take pride in having a great team of contributers with diverse backgrounds and skills, we must acknowledge that none of us is particularly skilled in design work. Case in point: our current logo was […]

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Hipsterville: The Unprecedented Future of Small Town Minnesota

A growing issue throughout Minnesota is the uncertain future of our small outstate towns. The state is full of small towns with a few thousand or fewer people. To generalize, these towns have some difficult years ahead of them – aging populations, migration towards large metropolitan areas, little to no industry. In many cases the […]

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The Fall and Rise of the I-35W Mississippi River Bridge – Part 1: Introduction

C: Starting Date Wednesday August 1 2007, at 6 hours, 5 minutes and 38 seconds pm V1: Metro, fifty cars there’s report of some sort of collapse in the construction zone. North of University [Avenue] V2: 437 V3: 551 I will be 10-8 [available for incidents] down here, she’s on her way doing triple A […]

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