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Author Topic: Divided highways with weird off grade intersections.  (Read 5018 times)

jakeroot

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Re: Divided highways with weird off grade intersections.
« Reply #50 on: June 24, 2018, 03:08:38 AM »

I simply find the Kirkwood Highway (DE-2) in the Wilmington area to be the strangest and most annoying road in the entire state: https://goo.gl/maps/MZqXpzq32xC2

There is some interesting geography here (obviously a hilly area), but I think the point of the thread was to point out roads where one direction was above or below the other direction.
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jeffandnicole

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Re: Divided highways with weird off grade intersections.
« Reply #51 on: June 24, 2018, 08:10:54 AM »

I simply find the Kirkwood Highway (DE-2) in the Wilmington area to be the strangest and most annoying road in the entire state: https://goo.gl/maps/MZqXpzq32xC2

There is some interesting geography here (obviously a hilly area), but I think the point of the thread was to point out roads where one direction was above or below the other direction.

Right here isn't too hilly. It's just a very busy area with a lot of roads, homes and businesses with a lot of nearby traffic lights. If you back far away on GSV you can see that they depressed this area to have Centerville Rd go under Kirkwood highway. You can access this area fully about 1/4 mile away on regular roads, or go thru a shopping center (Prices Corner) that gives access to both roads.
« Last Edit: June 24, 2018, 08:17:21 AM by jeffandnicole »
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ipeters61

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Re: Divided highways with weird off grade intersections.
« Reply #52 on: June 24, 2018, 10:42:49 AM »

I simply find the Kirkwood Highway (DE-2) in the Wilmington area to be the strangest and most annoying road in the entire state: https://goo.gl/maps/MZqXpzq32xC2

There is some interesting geography here (obviously a hilly area), but I think the point of the thread was to point out roads where one direction was above or below the other direction.

Right here isn't too hilly. It's just a very busy area with a lot of roads, homes and businesses with a lot of nearby traffic lights. If you back far away on GSV you can see that they depressed this area to have Centerville Rd go under Kirkwood highway. You can access this area fully about 1/4 mile away on regular roads, or go thru a shopping center (Prices Corner) that gives access to both roads.
That makes sense, it seemed like it had to be some forced geographic situation.  As far as I know, it's the only section of Kirkwood with an overpass.

I guess if we're on that subject, here's DE-896/US-301/DE-71 just before the Summit Bridge, or as I call it, the little expressway that couldn't: https://goo.gl/maps/iUoMr7r8BXx

Again, it's the only off-grade intersection that I know of on that road and when I was commuting from Newark to Dover, I went through it every day.
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Re: Divided highways with weird off grade intersections.
« Reply #53 on: June 24, 2018, 10:58:11 AM »

I'd say MD-24/MD-924/Tollgate Road in Abingdon, Maryland. People coming from I-95 north have to go through a traffic light at the end of MD-924 before proceeding onto MD-24 north.
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ErmineNotyours

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Re: Divided highways with weird off grade intersections.
« Reply #54 on: July 15, 2018, 11:06:20 PM »

The Los Angeles 110 Arroyo Seco Freeway was built using existing tunnels going east, and new bridges going west.  This allowed for weird left entrances like this until they were closed off.  I had seen this arrangement on a map, and could not picture what it really looked like or why until the internet came along.  Later it became cheaper to build bridges instead of tunnels, I guess.
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Flint1979

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Re: Divided highways with weird off grade intersections.
« Reply #55 on: November 04, 2018, 12:41:48 AM »

I don't know why I haven't really noticed this before but tonight I noticed that at exit 93 on I-75 which is where US-24 ends the northbound side has an overpass over Dixie Highway and the southbound side has an underpass under Dixie Highway. This interchange has ramps in the median with northbound Dixie to northbound I-75 the traffic merges onto I-75 in the left lane, same for southbound Dixie to southbound I-75.
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sparker

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Re: Divided highways with weird off grade intersections.
« Reply #56 on: November 04, 2018, 01:50:38 AM »

One more oddity on CA 99:  the Buhach Road interchange near Atwater has a NB flyover and LH exit/entrances SB in 99's median.  This was the main access to the old Castle AFB, now a local airport and industrial park; the configuration was intended to expedite military convoy movement to and from the base, which was one of the principal B-52 bases for Vietnam-era bombing missions.  This fact being well-known at that time, during 1967-71 there were invariably protestors lining the east side of CA 99, mostly on the frontage road.  They'd occasionally venture under the NB flyover onto the median, where they would be quickly escorted back by either CHP or Merced County sheriff's deputies (I personally witnessed -- and occasionally photographed -- these interactions during that time as a field reporter for the UC Riverside school newspaper).  The Caltrans long-range "master plan" for CA 99 will reconfigure this interchange as a conventional diamond with the through lanes on a berm (the proximity to the UP main line directly adjacent to the freeway dictates a "tight" ramp arrangement).
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jp the roadgeek

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Re: Divided highways with weird off grade intersections.
« Reply #57 on: November 04, 2018, 03:54:53 AM »

In downtown Hartford CT, I-84 does this twice. WB 84 goes beneath Asylum Avenue and Broad Street while EB 84 goes above Asylum Avenue and Broad Street.

And you also have the I-84/I-91 junction. The northbound lanes of I-91 pass under I-84, while the southbound lanes pass over. 
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ErmineNotyours

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Re: Divided highways with weird off grade intersections.
« Reply #58 on: November 06, 2018, 09:56:56 AM »

The Caltrans long-range "master plan" for CA 99 will reconfigure this interchange as a conventional diamond with the through lanes on a berm (the proximity to the UP main line directly adjacent to the freeway dictates a "tight" ramp arrangement).

Looks like it's already happened.
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ChezeHed81

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Re: Divided highways with weird off grade intersections.
« Reply #59 on: November 07, 2018, 12:35:26 PM »

The first one I could think of not previously mentioned is where the NJ Turnpike crosses Rt. 9 north of Exit 11 for the Garden State Parkway. There, three of the four Turnpike carriageways pass under Rt. 9 while only the SB truck lanes cross over Rt. 9.
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cl94

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Re: Divided highways with weird off grade intersections.
« Reply #60 on: November 07, 2018, 03:30:53 PM »

The Caltrans long-range "master plan" for CA 99 will reconfigure this interchange as a conventional diamond with the through lanes on a berm (the proximity to the UP main line directly adjacent to the freeway dictates a "tight" ramp arrangement).

Looks like it's already happened.

Correct. I drove through there in August and that area was Interstate grade.
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US 89

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Re: Divided highways with weird off grade intersections.
« Reply #61 on: November 07, 2018, 05:23:43 PM »

Here's something that I think qualifies north of Ogden, Utah. It's certainly weird, and I don't think I've ever seen anything else like it.

US 89 and UT 126, Hot Springs Junction

Southbound US 89 follows its own one-way carriageway through this intersection and is grade separated from 126, but all access between 126 and 89 is handled through a two-way carriageway which carries mainline northbound 89. That meets 126 at grade, with several weird left-turn ramps and merges.
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thefraze_1020

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cl94

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Re: Divided highways with weird off grade intersections.
« Reply #63 on: November 07, 2018, 06:13:15 PM »

We somehow haven't had the northern I-93/US 1 junction in Boston yet. The Storrow ramps and double-deck section to the north add to the confusion.
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jakeroot

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Re: Divided highways with weird off grade intersections.
« Reply #64 on: November 07, 2018, 06:17:26 PM »

There is a similar setup in Chehalis, WA:

https://www.google.com/maps/@46.6732801,-122.9712597,256m/data=!3m1!1e3?hl=en&authuser=0

Another similar-ish one...BC Hwy 1 @ Lougheed Highway, just northwest of Hope: https://goo.gl/CjX9nJ

Problem with these (and US 89's US 89 example), is that they technically don't involve divided highways (though both are certainly high-speed arterials).
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