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Highways and Rapid Transit: Should They Go Together?
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by Sarah Goodyear

Today on the Streetsblog Network, we've got a something of a debate going on the subject of putting new transit routes alongside highways in American cities.

Last Friday, Yonah Freemark at The Transport Politic noted the opening of Portland's Green Line with a post titled "Portland's New Rail Line Is Welcome News, but It's Not Routed as It Should Be." The line's location on the highway right-of-way, argues Freemark, will discourage transit-oriented development:

The highway makes an ideal right-of-way for the purpose of increasing speeds and reducing interference with surrounding neighborhoods, but it is the worst when it comes to spurring transit-oriented development. TOD, after all, should be the primary land use goal of any new public transportation investment, and Portland is likely to get very little of it along the Green Line. That’s because the mere presence of I-205, with its traffic, noise, and pollution, will make development adjacent to it unappealing. Worse, because the transit corridor will be located on one the side of the freeway, people will have to cross the very wide road to get to the other side.

Transit and freeways side by side in the upscale Charlottenberg neighborhood of Berlin.
But that's not how Jarrett Walker over at Human Transit sees it. Walker pulls out some pictures from a recent trip to Berlin to make his point. There, he notes, thriving upscale neighborhoods like Charlottenberg can be found on precisely this type of transit/freeway corridor:

When a New World city builds a rail line alongside a freeway, or even in its median, nobody expects the result to look like Berlin any time soon.  But it's not obvious that these can't be dense transit-oriented districts in their own style a few decades from now, if that's what local government wants.  Yes, it's always better to have the transit stop right inside the dense commercial core of a neighborhood.  But if we make that an absolute requirement in our thinking, we end up having to choose between either

  1. underground lines in places where we can't afford undergrounding, or
  2. elevated lines in places where community impacts just won't allow it or
  3. lines at grade on arterial streets, even if in exclusive lanes, that can't deliver a reasonable travel time given the long regional trips the line is intended to serve. 

And on most of the American rapid transit projects that I've been close to over the last two decades, any of those outcomes would have killed the project.

The Overhead Wire takes up the topic in a post called "When Road Engineers Do LRT":

I don't disagree with folks like Jarrett when they say that rapid transit has its best opportunities to run fast in the freeway. But at the same time, there are similar opportunities to leave the freeway ROW when it comes time to have a station and connect the places that people ultimately want to go, and the parcels that should be redeveloped into walkable districts.

I believe a perfect example of this is the Denver Tech Center. When they designed the T Rex project, why didn't they go forward with the option that would have allowed direct access to the center of the employment district? I imagine it was perceived cost compared to running time. It didn't matter that its where people wanted to go, when the train was moving it was running fast, so stopping on the other side of the freeway was a better option for the ridership modelers and the engineers designing the road.

And one more post on transit routing from the blog Say Yes to the Honolulu Rail System, which is written by a communications consultant to the City of Honolulu on their proposed rail line. He objects to a new proposal that would not be fully elevated and -- it seems to me on first inspection -- would run closer to some downtown destinations by diverging from the freeway right-of-way. Anyone know more about the relative merits of these proposals?

This piece originally appeared on Streetsblog New York City

Related posts:
Worldchanging Interview: Nancy Kete on the Future of the American Transportation System
In Seattle, Roads and Climate Get Hitched
Bus Rapid Transit
In Defense of High-Speed Rail

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