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Old December 4th, 2015, 04:11 AM   #3141
NFZANMNIM
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Quote:
Originally Posted by ChrisZwolle View Post
A DDI in Lexington, Kentucky.

Can't they use roundabouts instead of these things? like two signalized intersections... what for? lol
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Old December 4th, 2015, 04:40 AM   #3142
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I think a roundabout hurts flow too much
The DDI has only a single two-phase signal on either end.

If you exit the freeway and want to turn right, you have a YIELD or free movement
If you want to go left, you have only one light to pass (from the freeway or the minor road too)
If you go straight across, you have two lights

Roundabout is great for moderate flow that is balanced but if you get a large flow it clogs up :/
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Old December 4th, 2015, 08:21 AM   #3143
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Originally Posted by TM_Germany View Post
looks like the Foothills Parkway will be one hell of a nice drive, one day.
The current section that is open is already a nice drive, whenever they complete the newer sections it will be even more amazing.
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Old December 4th, 2015, 11:24 AM   #3144
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That missing link of the Foothills Parkway could open by summer 2017, according to news reports. It has been under construction since the 1980s. (not 1944, that's when it was approved, construction of the initial segments didn't began until the 1960s).

I doubt if the Wears Valley - Cosby segment will ever be completed. It's very low on the priorities list. It's really nice for tourists, but it won't solve many traffic issues in Tennessee.
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Old December 4th, 2015, 01:00 PM   #3145
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Quote:
Originally Posted by NFZANMNIM View Post
Can't they use roundabouts instead of these things? like two signalized intersections... what for? lol
Because Americans have historically had an irrational hatred for roundabouts, mainly.

IIRC in the literature there is research showing that roundabouts are markedly more efficient than signalized intersections in terms of throughput.
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Old December 4th, 2015, 01:41 PM   #3146
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Quote:
Originally Posted by NFZANMNIM View Post
Can't they use roundabouts instead of these things? like two signalized intersections... what for? lol
This actually looks like it is far more efficient and flows even better than a round about, though round abouts are quite nice.
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Old December 4th, 2015, 01:51 PM   #3147
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Dallas Horse Shoe Project progress update:










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Old December 4th, 2015, 01:56 PM   #3148
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I love how they frequently release new aerial photos of this project. All large projects should have it.

It's a huge concentration of bridges in that area.
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Old December 4th, 2015, 02:07 PM   #3149
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I never understood the purpose of those parkways. Are they just for tourists? Also the way they are build most of the time is interesting (grade separate, few exits..).
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Old December 4th, 2015, 05:01 PM   #3150
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What are you exactly referring to?
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Old December 4th, 2015, 05:06 PM   #3151
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Scenic parkways like the Foothills Parkway in Tennessee that was posted on the previous page.

They are mostly for tourists, trucks are usually banned and they serve hardly any developments. That's also a reason why they don't get much funding.

They built a pretty large bridge for the Natchez Trace Parkway in Tennessee:
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Old December 4th, 2015, 06:24 PM   #3152
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Quote:
Originally Posted by [atomic] View Post
I never understood the purpose of those parkways. Are they just for tourists? Also the way they are build most of the time is interesting (grade separate, few exits..).
I believe they're actually built and maintained by the National Park Service and the purpose is to make National Parks easier to get to (or get around in...Skyline Drive in Virginia is probably the main attraction of Shenandoah National Park).

Robert Moses' early parkways on Long Island had the same purpose although they now function as freeways (freeways which don't allow trucks).
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Old December 5th, 2015, 01:09 PM   #3153
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Such a waste of numbers for designation, with I175 and I375... All signs would be pointing towards 275, or the local downtown destinations anyways...
St. Petersburg, FL


Also, on an unrelated note, is there a reason why Florida's Turnpike isn't receiving an interstate designation? Or NJTP or GSP in Jersey for that matter?
Is it not legal for private companies to collect tolls and manage interstate highways? Don't Indiana, or Ohio have these types of toll highways which also have an Interstate designation? Just a general wonderation, thanks
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Old December 5th, 2015, 02:19 PM   #3154
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Quote:
Originally Posted by Penn's Woods View Post
I believe they're actually built and maintained by the National Park Service and the purpose is to make National Parks easier to get to (or get around in...Skyline Drive in Virginia is probably the main attraction of Shenandoah National Park).
The Blue Ridge Parkway (the other side of the Great Smokey Mountains from the Foothills Pkwy, with Skyline Drive being a northwards of extension of it) is the second most visited NPS site, IIRC.

Though I think that stat ignores the Baltimore-Washington Parkway - which is surely the NPS's busiest road.

Most of the parkways aren't about making national parks easier to get to/around. Skyline Drive is. John D. Rockerfeller Memorial Parkway (The route between Yellowstone and Grand Teton NPs that is also several US routes, and became part of the NPS to plug the small gap between the two parks, giving continuous NPS maintained land) is arguably about that. Colonial Parkway in Jamestown, etc area links together some NPS sites as well.
Quote:
Originally Posted by NFZANMNIM View Post
Such a waste of numbers for designation, with I175 and I375... All signs would be pointing towards 275, or the local downtown destinations anyways...
Why is it a waste? It's not like they would be used elsewhere!
Quote:
Also, on an unrelated note, is there a reason why Florida's Turnpike isn't receiving an interstate designation?
One has never been requested by FL DOT.
Quote:
Or NJTP
Most of it is interstate (I-295 at the bottom end, I-95 north of the PA Turnpike) and the bit that isn't has an interstate (I-295) running along the corridor toll free and not too far away.
Quote:
or GSP
Substandard (and doesn't allow trucks IIRC).
Quote:
in Jersey
Jersey is outside the FHWA's jurisdiction and has A, B and C roads rather than Interstates and the like :P
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Old December 5th, 2015, 03:06 PM   #3155
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I'd delete all interstate routes that are basically long ramps: the aforementioned I-175 and I-375, I-865 Northwest of Indianapolis, I-189 in Burlington VT, etc. I'd also delete I-180 in Cheyenne WY since it's not a freeway. I'd also sign every damn interstate highway, if you aren't going to sign it, don't designate it, you bastard. This is what I've done with I-595 in this proposal for adding a second beltway around Washington DC, fittingly numbered I-666 (Ignore the Speed Limit 85 section tag, as I added it as a reference to a running gag in another forum):


I'd also delete all business Interstate routes that run entirely on freeways, like Bus I-85 in Greensboro or Bus I-80 in Sacramento. Incidentally, deleting Bus I-80 from Sacramento would cause I-305 to surface.

And by the way, people in the area refer to New Jersey as just Jersey, although it's true Jersey is also one of the Channel islands, the crown dependencies of the UK off the coast of France, along with Guernsey and Alderney. This also explains how the versions of Jersey City in the original Grand Theft Auto (Guernsey City) and GTA IV (Alderney City) got their names.
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Old December 5th, 2015, 07:01 PM   #3156
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that map of DC threw me for a loop until I realized it's only a dream

I kind of like I-189 in Burlington. It's the only spur interstate in the whole state.
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Old December 5th, 2015, 11:28 PM   #3157
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Quote:
Originally Posted by CNGL View Post
(Ignore the Speed Limit 85 section tag, as I added it as a reference to a running gag in another forum):
though the lines eminating from it are at 90 degrees to where they ought to be for that in-joke. Otherwise it just looks like you think the joke is a suggestion of an 85mph speed limit, which it isn't, making you not 'in' the in-joke.
Quote:
And by the way, people in the area refer to New Jersey as just Jersey
Duh! Another joke that you didn't understand - did you not see the ':P' which, on other forums (and pretty much all messaging software) would turn into a smilie that means "don't take this seriously". Perhaps I ought to have put ""?
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Old December 5th, 2015, 11:30 PM   #3158
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I've realized I posted in the wrong thread, this is the one about anything that doesn't have a red, blue and white shield.
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Old December 6th, 2015, 12:50 AM   #3159
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State Hwy 504 in Waszyngton. Leading to Mount St Helens

DSC01037
by Geogregor*, on Flickr


P9232099
by Geogregor*, on Flickr


P9221961
by Geogregor*, on Flickr


P9221962
by Geogregor*, on Flickr


DSC01039
by Geogregor*, on Flickr


DSC01042
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DSC01043
by Geogregor*, on Flickr


DSC01044
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Old December 6th, 2015, 10:32 PM   #3160
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Still Hwy 504

DSC01045
by Geogregor*, on Flickr


DSC01049
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DSC01050
by Geogregor*, on Flickr


DSC01051
by Geogregor*, on Flickr


DSC01052
by Geogregor*, on Flickr


DSC01053
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DSC01055
by Geogregor*, on Flickr


DSC01056
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