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Concurrency Routes

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--- Quote from: Henry on October 05, 2022, 10:17:56 AM ---
--- Quote from: vdeane on October 04, 2022, 08:50:08 PM ---
--- Quote from: Henry on October 04, 2022, 03:08:21 PM ---The Penna Turnpike is followed by four different Interstates: I-76, I-70, I-276 and I-95. Between New Stanton and Breezewood (the two endpoints for the I-70 concurrency), I-76's mileposts and exit numbers are used. They continue to increase after I-76 leaves to enter Philadelphia and I-276 begins bypassing to the north, and even when I-95 comes in to cross the Delaware and join the NJTP on the other side.

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FYI, former exit 358 is now exit 42.

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Can't believe I overlooked that one! Of course, there was no interchange between I-95 and the Turnpike until the former was rerouted to follow the latter, so that may be an exception.

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the mileposts also follow I-95 now (IIRC, there was a period when they didn't).


--- Quote from: Quillz on October 04, 2022, 06:12:48 AM ---
--- Quote from: Amaury on October 04, 2022, 01:49:25 AM ---We can tell which route is the primary route based on which one comes first on the reassurance shields, whether it's on top or on the left.

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This isn't really reliable. In California, concurrencies technically do not exist at all. You have implied concurrencies, i.e. one route will exist but not signed. This isn't very consistent and more often than not, they do seem to be signed, but the order doesn't make sense. For example, during the brief CA-23/US-101 concurrency (more technically, CA-23 doesn't exist for a few miles while 101 bridges the gap), new signage in this area actually puts the 23 shield on top of the 101 shield. Not side to side. If anything, 101 shields should be on top. But they aren't. But then when you see CA-168/US-395, they are lined up side to side.

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This does not make sense. The 5/10 concurrency in downtown L.A. clearly exists, as does the 405/22 concurrency in Seal Beach.


--- Quote from: dbz77 on November 11, 2022, 09:00:20 PM ---This does not make sense. The 5/10 concurrency in downtown L.A. clearly exists, as does the 405/22 concurrency in Seal Beach.

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It makes sense in the following fashion. Each highway in California has a legal definition in the Streets & Highways Code. What we all I-5 is "Route 5", US 101 is "Route 101" and both SR 8 and I-8 are just parts of "Route 8" that use different signs. These legal definitions don't overlap, so there is a gap in one route's legal definition when it overlaps another route. Caltrans may sign a concurrency to connect the sections on either side of a gap, but the route doesn't technically exist there.


--- Quote from: US 89 on October 07, 2022, 08:17:50 AM ---
--- Quote from: Quillz on October 07, 2022, 07:41:12 AM ---Especially some places like Arizona and Colorado that will sign their US routes concurrent with their interstates across the entire state, it just seems unnecessary at that point.

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Huh? Colorado is at or near the top of the list for worst concurrency signage in the US. There are no standing US 87 shields in the state. Good luck following US 6 or US 85 through Denver without signs…

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No one:
Colorado: What are concurrencies?

jp the roadgeek:

--- Quote from: kirbykart on October 04, 2022, 06:20:49 PM ---The New York Thruway's mileposts are apparently more important than those of the Interstate routes that travel on it. Interestingly enough, the mileposts and exit numbers do reset on both I-90 and I-87, unlike the Kansas Turnpike situation mentioned upthread. And due to the Thruway's unorthodox directional routing, the mileposts start out okay at the southern end, but once you get to the east-west section what ends up happening is [pause to catch your breath] the mileposts are ascending backwards, with mile 120 or whatever in the Albany area, and mile 450 or whatever at Ripley at the PA line.

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I-87 technically has 4 and I-90 has  3 different sets of Mileposts.  I-87 has the Deegan (about 8 miles), the Thruway mainline (MP 0-MP 148), a brief concurrency with I-90 (using one set of I-90’s mileposts), then the Northway (about 185 miles).  I-90 has the Thruway mainline (347 miles, but signed MP 496-MP 149), Free 90 (briefly concurrent with I-87; 21 miles), and then the Berkshire Spur (18 miles, marked B6-B24, as it measures from the I-87 junction).


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