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Old September 19th, 2007, 04:51 PM   #21
Alex Von Königsberg
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In Washington state on I-90 some 30-50 km west of Seattle, they made a variable speed stretch (depending on weather conditions). The billboard is not a fancy one and it only shows text, but still a useful feature. I haven't seen variable speed limits in any other western states.



In California, this kind of billboards were used only to display travel time to certain destinations, accidents warnings and kidnapped children alerts.
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Old September 19th, 2007, 05:50 PM   #22
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I was hoping that, in the States, at least with electronic signs they would be more indulgent with the speed limit. It's a small pic, but I can still see the weather is nice and clear. 65 mph - 104 km/h is a very low speed limit for Interstates , many countries in Europe have 100 km/h for regular 2-lane roads.
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Old September 19th, 2007, 08:14 PM   #23
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^ haha, but in the states they give EVERYBODY a license cuz theres no other way to get around!


at least where i live (with posted at 65 mph), everyone goes 70-75 on average. people go 80+ all the time.

oh, yea - and in the bay area we have electronic signs that tell travel times and accidents and blah blah, but no variable speed limits.
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Old September 19th, 2007, 08:16 PM   #24
Alex Von Königsberg
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Well, when I drove in that area, the speed limit was set to 112 km/h (70 mph) which is the maximum allowed in Washington. While 112 km/h is still too slow for the interstates, I would like to mention that unlike European mountainous motorways which are flat, American interstates have much more curves. So, I would say that personally I felt on that stretch of I-90, 112 km/h would be completely justified.

P.S. Most of 2-lane roads in Washington are also posted with 100 km/h, and some of them even have 105 km/h (higher than German 2-lane landstrassen).
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Old September 19th, 2007, 09:51 PM   #25
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Quote:
Originally Posted by Alex Von Königsberg View Post
Well, when I drove in that area, the speed limit was set to 112 km/h (70 mph) which is the maximum allowed in Washington. While 112 km/h is still too slow for the interstates, I would like to mention that unlike European mountainous motorways which are flat, American interstates have much more curves.
It seems, that you didn't drive a lot on mountainous European motorways. At least in Alps they can be very curvy, but they still allow 130 km/h. Actually, for 130 km/h design speed, curve radius can be 700 m.
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Old September 19th, 2007, 10:07 PM   #26
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It seems, that you didn't drive a lot on mountainous European motorways. At least in Alps they can be very curvy, but they still allow 130 km/h. Actually, for 130 km/h design speed, curve radius can be 700 m.
I think no european country designs for 130. Hungary designs for 140,and allows 130 on motorways. I suppose Germany even designs for higher speeds.
+its not just the bend. The newer motorways here are like the HSR tracks...if you know what I mean...like a Nascar track.
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Old September 19th, 2007, 10:18 PM   #27
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Too long straight is also not good. We call that "Polderblindness", when people stare at the distance of a straight road, and have no idea what happens near them. A lot of one-car accidents happens this way on rural roads. This happens lesser on motorways here, because there are almost no empty motorways, except at night.

I think the German road designing for non-motorways is far superior than what we see in the Netherlands, the roads tends to be as narrow as possible, so a truck can just drive on it, but nothing more. Double middle markings, side markings 20 - 50cm away from the side etcetera. Dutch National roads have often lanes not wider than 2,75m.

Germans are really knowing how to build a Bundesstraße; straigth, wide (sometimes 4m per lane), and good markings, but also a lot of more capacity because of non level crossings. (fewer traffic lights).
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Old September 19th, 2007, 11:15 PM   #28
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Too long straight is also not good. We call that "Polderblindness", when people stare at the distance of a straight road, and have no idea what happens near them. A lot of one-car accidents happens this way on rural roads. This happens lesser on motorways here, because there are almost no empty motorways, except at night.

I think the German road designing for non-motorways is far superior than what we see in the Netherlands, the roads tends to be as narrow as possible, so a truck can just drive on it, but nothing more. Double middle markings, side markings 20 - 50cm away from the side etcetera. Dutch National roads have often lanes not wider than 2,75m.

Germans are really knowing how to build a Bundesstraße; straigth, wide (sometimes 4m per lane), and good markings, but also a lot of more capacity because of non level crossings. (fewer traffic lights).
Talking about at-grade intersections in Netherlands, it's quite curious to find that many intersections are managed by traffic lights, even in "national roads" or at intersections between a motorway and a conventional road. In other countries in Europe it's quite unusual.
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Old September 19th, 2007, 11:22 PM   #29
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Talking about at-grade intersections in Netherlands, it's quite curious to find that many intersections are managed by traffic lights, even in "national roads" or at intersections between a motorway and a conventional road. In other countries in Europe it's quite unusual.
We have a traffic light on M3 motorway inside Budapest
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Old September 19th, 2007, 11:23 PM   #30
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Quote:
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Talking about at-grade intersections in Netherlands, it's quite curious to find that many intersections are managed by traffic lights, even in "national roads" or at intersections between a motorway and a conventional road. In other countries in Europe it's quite unusual.
From what Chris shared with us about the traffic congestion, I say there probably isn't any other good solution available - roundabouts are quite impractical at those volumes of traffic, and dangerous too. Also traffic lights can probably be adjusted to stay green longer on the main route and can also be synchronized...
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Old September 19th, 2007, 11:25 PM   #31
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We have a traffic light on M3 motorway inside Budapest
Really? The only one I saw was the one at the huge stack interchange with Hungaria Avenue. Is there another beside that one?
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Old September 19th, 2007, 11:35 PM   #32
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Originally Posted by wyqtor View Post
Really? The only one I saw was the one at the huge stack interchange with Hungaria Avenue. Is there another beside that one?


sorry,I cant find photo for it...
BTW,there are no traffic lights at M3-Hungária junction...
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Old September 20th, 2007, 12:14 AM   #33
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Quote:
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BTW,there are no traffic lights at M3-Hungária junction...
I guess so... It was 1 May, I remembered the traffic jam and automatically thought there must have been a traffic light.
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Old September 20th, 2007, 12:21 AM   #34
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Quote:
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I guess so... It was 1 May, I remembered the traffic jam and automatically thought there must have been a traffic light.
The traffic light are farther away from there
The red lines are the traffic lights.
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Old September 24th, 2007, 03:24 PM   #35
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Sometimes texts can get scrambled...


Even a textline-VMS can show symbols


Newest development are GRIP (Graphic-VMS).


Here a variety of road systems in the Netherlands:
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Old September 25th, 2007, 03:12 AM   #36
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We have some of those signs on highways in Johannesburg, South Africa

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Old December 4th, 2007, 11:31 AM   #37
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More electronic signs in England

Here are some examples of the Message Sign Mark 4 (MS4) which are being installed on motorways in England to replace the older post mounted matrix signal style indicators (which were located in the central reservation). These photos are from the M4 motorway near Reading. The signs use LEDs and can display a range of text and graphical symbols.







The following photos show gantry mounted matrix signals and a two row x 12 character message sign (MS2).





Regards
Dave
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Old August 26th, 2008, 05:33 PM   #38
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Quote:
Originally Posted by aswnl View Post
Newest development are GRIP (Graphic-VMS).
That's the VMSL MS4 Riegel LED board. The Netherlands ordered 4 to trial, and I belive have installed several more subsequently.

Variable Message Signs Limited.

Regards, Simon.
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Old August 26th, 2008, 06:22 PM   #39
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I don't think that sign is handy when you drive past it for the first time. It is quite chaotic and you have to search for the arrow and the place where you go. By the time you've done that, you've past it already. It took me a couple of times to get it all clear
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Old August 26th, 2008, 06:26 PM   #40
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It's probably meant for the everyday commuter. I agree it's quite a mess, the sign isn't announced, so it's quite sudden. But it's expensive to repeat the GRIP a few times.

In France, they usually only show times, because there's often nothing to report on the rural Autoroutes:

A5 Troyes:
[IMG]http://i34.************/15ml8if.jpg[/IMG]

A75 Lodčve: (sign says: gas station Caylar, lots of LPG)
[IMG]http://i37.************/11mesd1.jpg[/IMG]
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