Quote:
Originally Posted by i-215
I'm not sure about how I feel about TRAX crossing at-grade at 5th and 6th (that close to the freeways). Maybe TRAX could go subgrade for that block?
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Yeah, or maybe the
road should go subgrade for those blocks.
Here's a case where Salt Lake City's huge blocks (meaning long distances between intersections) and wide streets could be put to a nice advantage. What if the through-lanes of 500 and 600 South could be below-grade for major intersections? This would clear up the intersections and make it better for pedestrians on the surface.
I'm thinking of going subgrade at 400 West, and then having a longer section for Main and State Streets. TRAX could go subgrade under State Street on 400 South.
Let's assume a road cross-section similar to the ramps at the western ends of 5th and 6th souths. These have 6-foot shoulders on each side and 4' for barriers/walls.
600 South at 4th West has 5 through lanes and 2 turn lanes. This makes the road over 90' wide, making for a scary cross walk. But what if we put the through-lanes underground? You'd have 2 12' crosswalks and a large landscaped median under the traffic lanes. The width of the median would be 75' (5 lanes *11 feet + 2 shoulders *6 feet + 2 walls/barriers *4 feet). At every other location I listed, there are only 4 through lanes, so the median width would be 66 feet wide.
In every case this makes the road wider, ie, the existing grassy park strips would be narrowed by a few feet, but in every case there would be a significant amount of green added to the center of the road, where the center through-lanes would be placed essentially underground in short cut-and-cover tunnels. It would look something like this:
And here is an idiot-level pain schematic of the main/state street underpasses:
As you can see, I've placed a roof over the trenched road so that we could create parks and green space where there used to be only roads.
I like the big landscaped median that can be produced when the center 4 lanes go underground. I like how we get two short crosswalks rather than one nasty one. I like how cross-traffic no longer stops TRAX trains on 400 S, 400 West, and on Main Street. And I like how State Street (and its future BRT line!) is similarly decongested.
This would likely be expensive, but not unprecedented. Here are some real-world examples:
https://www.google.com/search?q=narrow+u...ZBuC_AQ9C96BAgBEBs#imgrc=-TKzxJG16SczZM:
I think it is worth putting on the long-term calendar. What do y'all think?