Recent working paper:
Owen, A. and Levinson, D. (2014) Developing a Comprehensive US Transit Accessibility Database
- This paper discusses the development of a national public transit accessibility evaluation framework, focusing on lessons learned, data source evaluation and selection, calculation methodology, and examples of accessibility evaluation results. In both practice and in research, accessibility evaluation remains experimental and methodologically fragmented. This heightens the “first mover” risk for agencies seeking to implement accessibility-based planning practices, as they must select a method which might produce results that can only be interpreted locally. Development of a common baseline accessibility metric could advance the use of accessibility- based planning. The accessibility evaluation framework described here builds on methods developed in earlier project, extended for use on a national scale and at the Census block level. Application on a national scale involves assembling and processing a comprehensive national database of public transit network topology and travel times. This database incorporates the significant computational advancement of calculating accessibility continuously for every minute within a departure time window of interest. Values for contiguous departure time spans can then be averaged or analyzed for variance over time. This significantly increases computational complexity, but provides a very robust representation of the interaction between transit service frequency and accessibility at multiple departure times.
We have posted some additional historic data online at the University of Minnesota’s Digital Conservancy, representing the 1920-1995 Twin Cities State Highway Network. (This is the data visualized in the movie below)
|Please use this identifier to cite or link to this item:
|Title:||1920-1995 Twin Cities State Highway Network|
|Citation:||Chen, Wei and David Levinson. “1920-1995 Twin Cities State Highway Network”. Univ. of Minnesota Digital Conservancy. 2003. http://hdl.handle.net/11299/162818. Accessed: <date accessed>.|
|Abstract:||Vector line data with highway centerlines. Features may have attributes indicating year built and/or year divided. Also includes a PDF illustrating the data.|
|Description:||Illustrates the development of the highway network in the Twin Cities metropolitan region|
|Appears in Collections:||Data Sets|
|Files in This Item:
Steven Johnson Why The Bay Area Needs The Bay Lights [Transportation as art]
Created with over 25,000 energy efficient, white LED lights, it is 1½ miles wide and 500 feet high… The Bay Lights is a monumental tour de force seven times the scale of the Eiffel Tower’s 100th Anniversary lighting.
“A key part of the plan is building a frontage road for I-494 that connects the Hardman Avenue and Concord Street interchanges.
“This convenient frontage road access will open the area up to the market forces generated by the traffic on I-494 and will provide an improved environment for fostering retail, including restaurants,” the study reads.”
Atlantic Cities: Saving Detroit’s Public Transit By Privatizing It [A foot in the door to privatization.]
“Sony is building a new kind of power outlet that raises a not entirely pleasant prospect—in the future, plugging a phone into a public wall socket might require authentication and take a chunk out of your bank account. But the technology will have many important uses, Sony says, from managing payments for recharging electrical vehicles to avoiding blackouts by intelligently regulating the use of power.”
MasterCard is pitching: Leave the Hassle at Home: Commuting can be Easier with ONE Card for ALL Stops:
“The vast majority of commuters we surveyed think so. In fact, 72% of respondents in U.S., 85% in Singapore and 86% in South Korea told us they wish there was one card for use across all local mass transit systems. They also estimated that with one payment card they could save close to one hour (55 minutes!) per work week. Well, the capability already exists in MasterCard PayPass and for many, it’s already in your wallet.”
[Yes, I agree, though the time savings is probably exaggerated.].
Baruch Feigenbaum @ Reason says: I-85 Managed Lanes are A Success. [They may or may not be, these data do not prove one way or another yet, since total flows dropped and speeds rose. More people faster would be conclusive (from a transportation perspective, environmentalists would disagree). Fewer people faster is ambiguous, and depends on Value of Time. In percentage terms, speeds rose (3.2% in the GP lanes, 4.6% in the managed lane) more than flows dropped (1.7%)].
Brendon on Mode Shares in the Twin Cities (2000-2009)
Bike up from 0.5% to 0.9%.
Driving down 1.4% (most of the loss in carpools, but some in drove alone).
Work at home up 0.76%.
Joe Cortwright just released a very nice takedown of the TTI Urban Mobility Report (an essential, yet incomplete source of transportation data) Driven Apart. It is well worth reading. From the press release:
A new report from CEOs for Cities relased today unveils the real reason Americans spend so much time in traffic and offers a dramatic critique of the 25 year old industry standard created by the Texas Transportation Institute’s Urban Mobility Report (UMR) – often used to justify billions of dollars in expenditures to build new roads and highways. The surprising analysis by Joseph Cortright, senior policy advisor for CEOs for Cities, says the solution to this problem has much more to do with how we build our cities than how we build our roads.
The report, titled Driven Apart: How sprawl is lengthening our commutes and why misleading mobility measures are making things worse and supported by the Rockefeller Foundation takes a new look at what’s really causing traffic congestion in America and says that compact cities are the real answer to reduscing traffic delays. These conclusions are far different than those of the UMR, which has long been used to measure traffic congestion.