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Old June 14th, 2011, 09:27 AM   #6981
FM 2258
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Quote:
Originally Posted by Tom 958 View Post
And you're a certified road enthusiast, too. Surely normal people pay even less notice.

I found this, from Wisconsin, https://trust.dot.state.wi.us/static.../fdm/11-30.pdf :

"When designing new interchanges or reconstructing interchanges. Use parallel-type entrance ramps in rural or urban applications. Refer to Exhibits 10-69/70/71, pages 849-853, GDHS 2001 for more information.

"Taper-type entrance ramps have been used predominantly for interchange design in the past. However, studies [2] have shown that parallel entrance ramps are generally safer than tapered. With tapered entrance the driver
has less time and poorer angles in which to use side/rear-view mirrors to monitor surrounding traffic prior to merging. Taper-type entrance ramps can also cause confusion in mainline horizontal curve situations when the
driver cannot identify mainline alignment."

So there. I still prefer tapers, though.

At two-lane entrances, Georgia uses a taper that's painted like a parallel, and it works great. I mean really great: it's used (among many other places) at the most overloaded ramp terminal at Spaghetti Junction. While traffic backs up for capacity reasons almost every day, the ramp terminal, which reduces the ramp from two lanes to one at the merge point, functions even under LOS F conditions. Traffic may move at a snail's pace, but everyone makes the merge without undue difficulty.
Thanks for the explanation....I noticed that on parallel entrance ramps sometimes arrows are painted showing the lane ending.
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Old June 14th, 2011, 10:13 AM   #6982
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Parallel entrances have been the norm in Europe for a while now on motorways, although you can till get them on smaller roads and on old motorways.

Exits as well, although there are more tampered exits than entrances

EDIT:

The tampered entrance in that diagram is actually quite long. You have lots like that in the UK that are very very very long, while in sight of the speed of the traffic, often they have two lanes and one merges first, and a few hundred metres after, the other one merges
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Old June 14th, 2011, 10:49 PM   #6983
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Quote:
Originally Posted by Rail Claimore View Post
Tapered is superior to parallel. I can't even count the number of times someone in front of me continues forward on a parallel entrance ramp thinking the lane won't end, then suddenly stopping because they can't merge properly.

Tapered ramps force drivers on the ramp to actually look at traffic on the main lanes before making the merge, and it also encourages drivers on the main lanes to move over to let people in when safe to do so.
WisDOT just replaced several 'tapered' merges with very long parallel ones on US 41 here in the Appleton, WI area. They are set apart from the mainline lanes with much shorter and more frequent lane stripes than the ones separating the mainline lanes. I like them because they allow drivers much more room to find a space in traffic to fit in.

Mike
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Old June 15th, 2011, 12:04 AM   #6984
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I-76 Philadelphia

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Old June 15th, 2011, 12:28 AM   #6985
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Nice bridge...
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Old June 15th, 2011, 01:32 AM   #6986
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I live a couple of miles from that spot. That's a railroad bridge that must have been built in the 1860s or '70s. Amtrak's main East Coast passenger service crosses it.

Upon further research, I stand corrected: it's the bridge I thought it was, and the rail line itself is that old, but the bridge is not the original: http://en.wikipedia.org/wiki/Pennsyl...Railway_Bridge
That's assuming anyone cares. :-)

Re the Providence photo upthread: I drove through there last week, but in the other direction.
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Old June 15th, 2011, 02:49 AM   #6987
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Quote:
Originally Posted by Penn's Woods View Post
I am in New England for a few days at the moment; on Wednesday I drove from home (Philadelphia) to Attleboro, Massachusetts. So I was in six states (mostly small ones) in the space of six hours, and I can't remember which one it was, but somewhere I saw a "have two accidents in work zones - lose your license" sign, or words to that effect. "Fines doubled in work zones" are fairly standard; you'll probably see them in most states.
What I noticed is that whenever signs like these (and some "radar enforced" signs) are posted you are free to speed and do whatever you want because there are no cops to enforce anything, so they just put up threatening signs instead
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Old June 15th, 2011, 04:21 AM   #6988
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Oh, sure. (Although I saw plenty of state troopers in Massachusetts.)

On the other hand,though, think about it: how many people have two work-zone accidents? What are the odds? It's probably pretty hypothetical. But an accident's not like speeding; it's not up to a cop to decide to ignore it. The police show up, insurance papers are exchanged, and so on, so there will be whatever consequences the law provides for. So I'd take a sign like that seriously: If the law in your state says two accidents in work zones causes you to lose your license, I assume that means you really will. In the unlikely and really unlucky event it happens to you.
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Old June 15th, 2011, 06:12 AM   #6989
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Quote:
Originally Posted by Rail Claimore View Post
Tapered is superior to parallel. I can't even count the number of times someone in front of me continues forward on a parallel entrance ramp thinking the lane won't end, then suddenly stopping because they can't merge properly.

Tapered ramps force drivers on the ramp to actually look at traffic on the main lanes before making the merge, and it also encourages drivers on the main lanes to move over to let people in when safe to do so.
Tapers are bad in heavy areas. There's a taper instead of a parallel where DE 141 enters onto I-295 northbound here in Delaware. It's two lanes of I-295, basically heading from DC to New York City, so it's obviously a busy route. There's never really any space and you can't move over a lane because there's a ton of tractor trailers, buses, etc in both lanes. So the person getting onto I-295 has to thread the needle and find a spot well beforehand and hope that no one closes the spot up when you reach the taper point.
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Old June 15th, 2011, 06:15 AM   #6990
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I guess I'm getting a little too off-topic, but one sign that aggravates me is "Fines doubled for speeding". How is this not double punishment? Is there a fine for not speeding or something?
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Old June 15th, 2011, 07:21 PM   #6991
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don't speed, then you don't have to worry about it
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Old June 15th, 2011, 10:28 PM   #6992
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Quote:
Originally Posted by Jschmuck View Post
don't speed, then you don't have to worry about it
Haha....yeah right. Speeding makes roads more fun.
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Old June 15th, 2011, 10:31 PM   #6993
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Quote:
Originally Posted by xzmattzx View Post
I guess I'm getting a little too off-topic, but one sign that aggravates me is "Fines doubled for speeding". How is this not double punishment? Is there a fine for not speeding or something?
How about a sign "fines halve outside work zones" ?
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Old June 17th, 2011, 11:18 PM   #6994
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Interstate 95 in the morning

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Interstate 495 on the Bus lane , Eastbound through Union city to Lincoln Tunnel.



Evening Rush Hour along 495

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Interstate 95

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Old June 18th, 2011, 12:06 AM   #6995
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Lovely pictures man! Like the video too.
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Old June 18th, 2011, 04:03 AM   #6996
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Yes. Nice.
And those who were following the discussion a few days ago - was it on the France thread? - about bus lanes on freeways will note the one approaching the Lincoln Tunnel.
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Old June 20th, 2011, 05:36 PM   #6997
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Great video of Interstate 64 in Saint Louis

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Old June 20th, 2011, 10:43 PM   #6998
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Quote:
Originally Posted by ChrisZwolle View Post
Great video of Interstate 64 in Saint Louis
Brilliant! This tune is great to drive urban freeway
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Old June 21st, 2011, 03:10 AM   #6999
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Nice vid there. I didn't know I-64 had double-decked sections out there.

It seems that the route has more urban/downtown sections the further west you go (St. Louis, Louisville). Doesn't look like that in any of the bigger cities in Virginia.

As evidence, here's a vid I found of I-64 eastbound through Louisville:

Last edited by Professor L Gee; June 21st, 2011 at 03:22 AM. Reason: learned how to embed!
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Old June 21st, 2011, 04:06 AM   #7000
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I can't believe they did a full reconstruction of I-64 and didn't provide full-width left shoulders.
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