daily menu » rate the banner | guess the city | one on oneforums map | privacy policy | DMCA | news magazine | posting guidelines

Go Back   SkyscraperCity > Infrastructure and Mobility Forums > Highways & Autobahns

Highways & Autobahns All about automobility



Global Announcement

As a general reminder, please respect others and respect copyrights. Go here to familiarize yourself with our posting policy.


Reply

 
Thread Tools
Old September 25th, 2011, 06:33 AM   #61
xrtn2
Registered User
 
xrtn2's Avatar
 
Join Date: Jan 2011
Location: Valadares, Brazil
Posts: 19,663
Likes (Received): 17481

Porto alegre BRAZIL

__________________
BRAZIL !
xrtn2 no está en línea   Reply With Quote

Sponsored Links
Old September 25th, 2011, 11:33 AM   #62
diablo234
Oh No He Didn't
 
diablo234's Avatar
 
Join Date: Aug 2008
Posts: 5,297

Are you sure that is a ramp meter?

That looks like a simple traffic light setup to me.
diablo234 no está en línea   Reply With Quote
Old September 25th, 2011, 02:43 PM   #63
Desertstorm
BANNED
 
Join Date: Aug 2011
Location: Australia
Posts: 7
Likes (Received): 0

Melbourne does on some of its freeways. They're meant to ease congestion on the freeway itself, but IMO they just create another problem, often the queue of traffic waiting to get on the freeway stretches right back to the start of the ramp and you can be waiting 5-10 minutes and can obstruct the surface street if traffic is particularly bad. Basically an identical design to the U.S. system. Here they only operate when traffic is heavy though, so outside of peak periods they are switched off thank god.



Quote:
Originally Posted by WonderlandPark View Post
What is weird, here in Southern California is a ramp meters are installed on transitions to other freeways/motorways. So you exit a freeway to join another and there is a ramp meter in between.
Quote:
Originally Posted by diablo234 View Post
When I visited Minneapolis a while back I also noticed they had ramp meters at freeway/freeway interchanges. I am not sure if those are effective compared with having ramp meters on interchanges with secondary streets/roads.
that sucks! They haven't done that here, we only have them on freeway to surface street interchanges, and not every freeway has them.

Are they switched on only in peak hour in other countries like here, or constantly regardless of traffic volume/time of day?

Last edited by Desertstorm; September 25th, 2011 at 02:55 PM.
Desertstorm no está en línea   Reply With Quote
Old September 25th, 2011, 08:25 PM   #64
diablo234
Oh No He Didn't
 
diablo234's Avatar
 
Join Date: Aug 2008
Posts: 5,297

Quote:
Originally Posted by Desertstorm View Post
that sucks! They haven't done that here, we only have them on freeway to surface street interchanges, and not every freeway has them.

Are they switched on only in peak hour in other countries like here, or constantly regardless of traffic volume/time of day?
In Minneapolis and most other US cities they are only used during rush hour, otherwise they are turned off or they just have a yellow flashing light which means they can proceed without stopping.
diablo234 no está en línea   Reply With Quote
Old September 25th, 2011, 08:46 PM   #65
ChrisZwolle
Road user
 
ChrisZwolle's Avatar
 
Join Date: May 2006
Location: Zwolle
Posts: 43,571
Likes (Received): 19362

Ramp meters only make sense when the motorway is operating over, at or near capacity. Although hourly traffic volumes off-peak are actually not that much lower than during peak hour, they don't require ramp metering. Ramp metering is visible proof a motorway does not function properly. Motorway capacity is only marginally improved with ramp metering, but the lack of columns of vehicles merging at the time improves traffic flow. However, it is known that some ramp meters cause unacceptable delays at on-ramps (15 - 20 minutes or even longer is not unheard of).
ChrisZwolle está en línea ahora   Reply With Quote
Old September 26th, 2011, 10:00 PM   #66
myosh_tino
Registered User
 
myosh_tino's Avatar
 
Join Date: Apr 2010
Location: Cupertino, CA
Posts: 115
Likes (Received): 16

When the West Valley Freeway (California State Route 85) was built from south San Jose to Cupertino in 1994, it was the first freeway to feature metering lights (that's what we call them) on all on-ramps including freeway-to-freeway ramps. After the freeway was opened, the complaints came pouring in about having to wait to enter highway 85, especially on the northbound US 101 ramp to northbound highway 85 in south San Jose. A local newspaper columnist writes...

Back in 1994 and 1995, I tested the meters on Highway 85, and the result was impressive...

* With all meters off, the 25-mile-plus commute from South San Jose to Mountain View took nearly an hour.

* With the freeway-to-freeway meters off and the meters on city streets turning red to green as fast as possible: 45 minutes. That included no wait on the ramp from 101 to 85 in San Jose.

* When the meters were all turned on and slowed down as Caltrans designed, the entire commute — including a five-minute-plus wait at the 101 to 85 ramp — took 33 minutes.
myosh_tino no está en línea   Reply With Quote
Old September 29th, 2011, 01:06 AM   #67
Squiggles
Registered User
 
Squiggles's Avatar
 
Join Date: Aug 2007
Location: Madison
Posts: 728
Likes (Received): 22

Madison has a few ramp meters on the Beltline around the south side. They seem pretty pointless though; if you know how to merge, they seem rather unnecessary.
Squiggles no está en línea   Reply With Quote
Old September 29th, 2011, 02:40 AM   #68
poshbakerloo
***Alexxx***
 
poshbakerloo's Avatar
 
Join Date: Jan 2007
Location: London, Manchester, Cheshire, Sheffield, Moscow
Posts: 5,090
Likes (Received): 286

I know in the UK they use them on a lot of the roundabout interchanges to help with the cross traffic
__________________
"BEFORE WE MARRY...I HAVE A SECRET!"

I <3 London
poshbakerloo no está en línea   Reply With Quote
Old October 16th, 2011, 10:29 PM   #69
keokiracer
Roadgeek from NL
 
keokiracer's Avatar
 
Join Date: Aug 2011
Location: Halsteren (NL)
Posts: 3,672
Likes (Received): 2628

In The Nethelands we've got a lot of them, but this one is special: from highway to highway!
Exact location (green arrow)



They don't use it anymore since shoulder running was allowed op the A9. Further down the road there used to be another one (A205). It's still there I think, but it's never actually working anymore.

There used to be one here (green arrow again) too, but that one is gone
keokiracer no está en línea   Reply With Quote
Old July 15th, 2013, 12:50 PM   #70
volodaaaa
Registered User
 
volodaaaa's Avatar
 
Join Date: Apr 2013
Location: Bratislava, Slovakia
Posts: 3,228
Likes (Received): 1747

I think, most of the traffic lights on motorways are put in front of tunnel entrances in Europe. The task is easy: to avoid vehicles with running engine stay in tunnel during congestions.
__________________
Been/drove my car in: SK, CZ, D, A, H, PL, I, F, E, RSM, CH, FL, SLO, HR, SRB, BiH, MK, GR, BG, RO

volodaaaa no está en línea   Reply With Quote


Reply

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Related topics on SkyscraperCity


All times are GMT +2. The time now is 10:12 PM.


Powered by vBulletin® Version 3.8.11 Beta 4
Copyright ©2000 - 2018, vBulletin Solutions Inc.
Feedback Buttons provided by Advanced Post Thanks / Like (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.

SkyscraperCity ☆ In Urbanity We trust ☆ about us | privacy policy | DMCA policy

tech management by Sysprosium