Double reverse secret probation interchanges

Here’s a little animation showing the logic of diverging diamond interchanges, which came up in class last time. There are a bunch of these explainers online, many produced by departments of transportation trying to head off driver terror and/or protests in the months before such an interchange opens in their jurisdiction. I picked this one because it shows the arduous route any pedestrian would have to take to get through. But as there are commonly few pedestrians at such interchanges, the faster, safer throughput for cars probably makes it all worth it. So long as the signal lights don’t go out.

Really bad traffic


We’ll be talking about sprawl and traffic next time. As bad as I-35 can get for Texas State students, at least you’re not stuck in the unending traffic jams of Dhaka, Bangladesh.

In our discussion of traffic congestion, we’ll be looking at data from the Texas A&M Traffic Institute. Their methodology is rigorous, but not without critics, such as the number crunchers at City Observatory who have calculated a Cappucino Congestion Index.

Next idea: in some places, cities have revamped formerly car-centric roadways and areas to make them more pedestrian friendly, or to remove the cars entirely. Here’s a slide show of Google street view images showing some examples of such changes.

Levittown, PA

Click above for the March of Time story about the building of Levittown. Also, the video below, “Crisis in Levittown,” provides contemporary coverage of the controversy surrounding the first black family moving in to Levittown in 1957.


This is the song Heller mentioned in the essay you read for today. The Smiths were everything to a certain kind of high school kid in the 80s.