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Old March 10th, 2010, 12:38 PM   #5421
poshbakerloo
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There a highway (I forget which one) somewhere in south western Utah which I travelled on in 2008 that is pretty much running along the bottom of a very narrow canyon. And then at some point on a cliff face!
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Old March 10th, 2010, 12:41 PM   #5422
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San Rafael Swell. One of the coolest Interstate sections in the United States.

Freewaybrent made an awesome video:

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Old March 10th, 2010, 06:24 PM   #5423
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There is a cool part on the 15 north of Vegas in Arizona where the road goes straight toward some steep mountains and then at the last minute does a quick curve and tucks neatly between them. It was pretty interesting.
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Old March 10th, 2010, 06:42 PM   #5424
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i saw that pic of rocks on the highway in my local newspaper yesterday... i'd hate to have to drive through that.
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Old March 11th, 2010, 03:01 AM   #5425
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Quote:
Originally Posted by ChrisZwolle View Post
San Rafael Swell. One of the coolest Interstate sections in the United States.

Freewaybrent made an awesome video:
It is cool video indeed. But I have to say I-15 north of Las Vegas is equally or even more spectacular. Or how about I-84 in Columbia River Gorge in Oregon.
By the way last year I drove UT 24 from Hanksville to I-70 and then US 6 to Salt Lake City. All these roads are spectacular.
On UT 24 first time in my life I reached just about 100mph
It is two lane highway but dead straight, you could drive 150mph with no problem. Unfortunately (or fortunately, depends from the point of view) my rental car just couldn't do more as it was slightly uphill
Honestly I don't see the point of 75mph speed limit on I-70 (or on most of the rural interstates in that matter). Just put warning signs ahead of the curves and let people drive as they wish.
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Old March 11th, 2010, 04:19 AM   #5426
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Quote:
Originally Posted by nerdly_dood View Post
i saw that pic of rocks on the highway in my local newspaper yesterday... i'd hate to have to drive through that.
You don't drive through it, there are rocks in the way
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Old March 11th, 2010, 04:35 AM   #5427
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Here is that section of I 15 I was referring to. Just tucks right into that canyon. Virgin River Gorge in Arizona.

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Old March 11th, 2010, 07:53 AM   #5428
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Nice video from I-70 and I-15.

The I-15 stretch north of Vegas only crosses Arizona for about 30 miles, but it is spectacular.

The I-70 stretch in Utah is amazing, too. And I agree, with little traffic, speed limits there are not needed, except for curves. But that becomes a political debate. Some areas of Texas and Utah currently have 80 mph limits in limited areas.
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Old March 11th, 2010, 09:58 AM   #5429
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Virgin River This is a highway?
winding and it is impossible to develop a 150 km / h -200 km / h

Some idiot is designed, it should make up the tunnel to be rode straight.
Other roads have nice
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Old March 11th, 2010, 11:37 AM   #5430
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Quote:
Originally Posted by pwalker View Post
Nice video from I-70 and I-15.

The I-15 stretch north of Vegas only crosses Arizona for about 30 miles, but it is spectacular.

The I-70 stretch in Utah is amazing, too. And I agree, with little traffic, speed limits there are not needed, except for curves. But that becomes a political debate. Some areas of Texas and Utah currently have 80 mph limits in limited areas.
Even 80 mph is still incredible low on straight rural interstates, look at highways in Kansas, Wyoming, Idaho.
The only problem might be poor line discipline among US drivers. But it could be connected as some sort of campaign, promoting keeping to the right as part of introducing higher speed limits. It could work if well done.

[QUOTE=GOUST]Virgin River This is a highway?
winding and it is impossible to develop a 150 km / h -200 km / h[QUOTE]

It is great road, I drove there last year as well, no probles. Of course you have to slow down but what a spectacular drive it is. I prefer it from another boring tunnel. You can drive half of the Italian Alps and almost not see mountains. Comparing with that, US interstates are very refreshing.
In places like that speed limit makes perfect sense but there are oly relatively short winding stretches on interstetes west of Mississippi.


Quote:
Some idiot is designed, it should make up the tunnel to be rode straight.
Other roads have nice
Some idiot would design tunnel where it is not needed at all.

Last edited by geogregor; March 11th, 2010 at 01:49 PM.
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Old March 11th, 2010, 01:25 PM   #5431
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Quote:
Originally Posted by ChrisZwolle View Post
San Rafael Swell. One of the coolest Interstate sections in the United States.

Freewaybrent made an awesome video:

Wow! What a beautiful route
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Old March 11th, 2010, 04:39 PM   #5432
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Quote:
Originally Posted by geogregor View Post
It is cool video indeed. But I have to say I-15 north of Las Vegas is equally or even more spectacular. Or how about I-84 in Columbia River Gorge in Oregon.
By the way last year I drove UT 24 from Hanksville to I-70 and then US 6 to Salt Lake City. All these roads are spectacular.
On UT 24 first time in my life I reached just about 100mph
It is two lane highway but dead straight, you could drive 150mph with no problem. Unfortunately (or fortunately, depends from the point of view) my rental car just couldn't do more as it was slightly uphill
Honestly I don't see the point of 75mph speed limit on I-70 (or on most of the rural interstates in that matter). Just put warning signs ahead of the curves and let people drive as they wish.
Because the "safety nuts" would come out the wood work with their usual cry about how dangerous something like that would be. I wouldnt mind seeing no speed limits on rural interstates, or seeing some kind of electronic system that could determine the proper speed limit according to weather conditions and/or traffic volume. I thought the purpose of having limited access interstates was to get a person from point A to point B as quickly as possible.
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Old March 11th, 2010, 04:43 PM   #5433
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It's way too expensive to install electronic signs on every mile of rural interstate that carries 30,000 AADT or less. I'd say a 75 - 80 mph speed limit is quite fair. I've read Illinois is finally considering raising their speed limits. Only from 65 to 70 mph, but it's a start.
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Old March 11th, 2010, 05:04 PM   #5434
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I agree with GOUST--the length of I-70 shown in FreewayBrent's clip is in many respects a textbook example of how not to design a freeway. With bright sunlight over the driver's (and videographer's) shoulder, the cuts and fills look rather impressive, but the curves fail perspective evaluation. As a general rule, the alignment of a high-speed road should look like a string hanging naturally between your current position and the "vanishing point" (the furthest point on the highway that is visible to you). In contradistinction, the video clip shows several instances of the I-70 alignment slewing abruptly to one side, and then back to the other side, between the driver's eye position and the vanishing point. It would have been more expensive but would have given a much better service to motorists if viaducts had been constructed to bypass these sharp curves. I do not think an alignment optimized to pass perspective evaluation would have had to have tunnels, and the views of the landscape off to the sides would have been more or less the same. A less tortuous alignment would give drivers a fuller opportunity to enjoy the scenery.

I have actually driven this length of I-70 myself, but only at night. I would say that 60 MPH is a reasonable speed only by daylight in a car with grippy tires. At night, and with only the lane and shoulder striping to provide positive guidance, the curves are extremely punishing since they have high degree, high delta, and because I-70 is in an icing-prone part of Utah, low maximum superelevation. This means that the side friction demand is great and less of the retroreflective striping is visible in the car headlamps at night, which makes it difficult to tell when a curve ends and tangent begins. From memory, the recommended speed for truckers on this portion of I-70 (which is also called the Spotted Wolf Alignment) is either 35 or 45 MPH and I had to set my cruise control to 40 MPH to handle the curves safely in pitch-black dark.
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Old March 11th, 2010, 06:38 PM   #5435
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Quote:
Originally Posted by GOUST View Post
Virgin River This is a highway?
winding and it is impossible to develop a 150 km / h -200 km / h

Some idiot is designed, it should make up the tunnel to be rode straight.
Other roads have nice
The speed limit is 88 km/h (55 mph) which used to be the speed limit on all urban highways so it is not too slow. Im thinking you can do 100 km/h and be fine. I think there is not enough traffic through the road to justify the investment in tunnels. There would be MANY to traverse the distance. The goal was just to put a higher capacity road through the area to allow connectivity, I don't think achieving modern roadway speed was an objective.
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Old March 11th, 2010, 07:52 PM   #5436
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Quote:
Originally Posted by dl3000 View Post
You don't drive through it, there are rocks in the way
no, i mean when they're falling...
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Old March 12th, 2010, 01:34 AM   #5437
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I was joking. It rarely happens. I remember I had some friends from Jersey over and one was driving and the sign said caution falling rocks and he was all paranoid. When it does though, godspeed.
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Old March 13th, 2010, 03:58 AM   #5438
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U.S. highways (at least the old ones) don't exactly meet the standard of 80 mph design. There are certainly some parts where 70-80mph are possible, but there's always a curve or two in there that is unacceptable for the road.

I think crowned roadway is a factor too. Crowned roadways seem to make superelevation for high speeds difficult. I have yet to see a crowned highway where superelevation is completely smooth.

And there's also a restriction of how much a road can be superelevated due to icing conditions (they don't want cars sliding inwards during snow/ice situations).
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Old March 13th, 2010, 10:09 AM   #5439
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What's the speed limit in the USA when driving on motorways?
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Old March 13th, 2010, 10:33 AM   #5440
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Usually 55 - 65 mph in urban areas and 65 - 75 mph in rural areas, depending on state. Some sections in Texas and Utah allow 80 mph.

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