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National Boards => General Highway Talk => Traffic Control => Topic started by: Lukeisroads on October 07, 2022, 09:25:53 AM

Title: The Ramp Meter Thread
Post by: Lukeisroads on October 07, 2022, 09:25:53 AM
Ok So I Wont review em ill instead look at them. So Post It Down Below!
Title: Re: The Ramp Meter Thread
Post by: roadman65 on October 07, 2022, 09:31:30 AM
https://www.flickr.com/photos/54480415@N08/52394111003/in/dateposted-public/
Title: Re: The Ramp Meter Thread
Post by: kirbykart on October 07, 2022, 09:59:05 AM
Quote from: Lukeisroads on October 07, 2022, 09:25:53 AM
Ok So I Wont review em ill instead look at them. So Post It Down Below!
But why Wont You review em?
Title: Re: The Ramp Meter Thread
Post by: 1995hoo on October 07, 2022, 10:07:32 AM
Quote from: kirbykart on October 07, 2022, 09:59:05 AM
Quote from: Lukeisroads on October 07, 2022, 09:25:53 AM
Ok So I Wont review em ill instead look at them. So Post It Down Below!
But why Wont You review em?

I'd be more concerned about his apparent illness and whether it's contagious, although since I don't live in California hopefully it'll be a nonissue for me.
Title: Re: The Ramp Meter Thread
Post by: Rothman on October 07, 2022, 10:14:07 AM
All your base are belong to us.
Title: Re: The Ramp Meter Thread
Post by: formulanone on October 07, 2022, 10:17:26 AM
We are not your servants.

Suggestion: Go to Google Street View (or equivalent). Find an interstate ramming through the guts of a city, there's a 50-50 chance you'll find yourself some ramp meters to look at.
Title: Re: The Ramp Meter Thread
Post by: roadman65 on October 07, 2022, 11:42:46 AM
Quote from: roadman65 on October 07, 2022, 09:31:30 AM
https://www.flickr.com/photos/54480415@N08/52394111003/in/dateposted-public/

I-80 (and many other freeways) is one that has plenty in the Bay Area.  Ditto for LA area on I-5 and others.
Title: Re: The Ramp Meter Thread
Post by: JoePCool14 on October 07, 2022, 11:51:44 AM
Typical Chicago ramp meters will have this assembly upstream on the ramp:
https://goo.gl/maps/riwMnh8NM4JwuKMdA

And then the actual meter downstream:
https://goo.gl/maps/suS92E9hNLidQYrn7

You won't review them, but I will. I think the meter signals be so small makes them really easy to miss. I also wonder how their activation sequence goes since there's no yellow ball.

My favorite ramp meter is actually the one near my office at Cumberland. There's the typical Ramp Meter Ahead warning sign, and the ramp is stripped like one I posted above. The thing is, the meter is so good that it never turns red and is actually invisible. Really impressive and innovative.

https://goo.gl/maps/q2Vw3i243zeG6FZv6
Title: Re: The Ramp Meter Thread
Post by: roadman65 on October 07, 2022, 12:01:35 PM
https://www.flickr.com/photos/54480415@N08/51295882184/in/album-72157719505204933/

This one evaluate please. To me with the bottleneck beyond the meters, it defeats the entire purpose of having.
Title: Re: The Ramp Meter Thread
Post by: kphoger on October 07, 2022, 12:07:10 PM
Quote from: JoePCool14 on October 07, 2022, 11:51:44 AM
My favorite ramp meter is actually the one near my office at Cumberland. There's the typical Ramp Meter Ahead warning sign, and the ramp is stripped like one I posted above. The thing is, the meter is so good that it never turns red and is actually invisible. Really impressive and innovative.

https://goo.gl/maps/q2Vw3i243zeG6FZv6

:biggrin:

https://goo.gl/maps/Ke9MucU6PXPPvo7Y8
Title: Re: The Ramp Meter Thread
Post by: roadman65 on October 07, 2022, 12:17:31 PM
Quote from: kphoger on October 07, 2022, 12:07:10 PM
Quote from: JoePCool14 on October 07, 2022, 11:51:44 AM
My favorite ramp meter is actually the one near my office at Cumberland. There's the typical Ramp Meter Ahead warning sign, and the ramp is stripped like one I posted above. The thing is, the meter is so good that it never turns red and is actually invisible. Really impressive and innovative.

https://goo.gl/maps/q2Vw3i243zeG6FZv6

:biggrin:

https://goo.gl/maps/Ke9MucU6PXPPvo7Y8
. What I like is no wasted yellow section as Caltrans and Oregon both seem to have full heads despite the yellow is not used.
Title: Re: The Ramp Meter Thread
Post by: JoePCool14 on October 07, 2022, 12:30:23 PM
Quote from: roadman65 on October 07, 2022, 12:17:31 PM
What I like is no wasted yellow section as Caltrans and Oregon both seem to have full heads despite the yellow is not used.

Do they not use yellow when the sequence starts?

Quote from: kphoger on October 07, 2022, 12:07:10 PM
Quote from: JoePCool14 on October 07, 2022, 11:51:44 AM
My favorite ramp meter is actually the one near my office at Cumberland. There's the typical Ramp Meter Ahead warning sign, and the ramp is stripped like one I posted above. The thing is, the meter is so good that it never turns red and is actually invisible. Really impressive and innovative.

https://goo.gl/maps/q2Vw3i243zeG6FZv6

:biggrin:

https://goo.gl/maps/Ke9MucU6PXPPvo7Y8

They built new pads for new signals but never installed them. I might contact IDOT and ask them why. They definitely could use them here.

Quote from: roadman65 on October 07, 2022, 12:01:35 PM
https://www.flickr.com/photos/54480415@N08/51295882184/in/album-72157719505204933/

This one evaluate please. To me with the bottleneck beyond the meters, it defeats the entire purpose of having.

You should watch Road Guy Rob's video on ramp meters. He explains why having the ramp meters on is still useful. The quick explanation is that it does theoretically still help to end the traffic jam sooner.
Title: Re: The Ramp Meter Thread
Post by: jeffandnicole on October 07, 2022, 12:57:25 PM
Quote from: JoePCool14 on October 07, 2022, 12:30:23 PM

You should watch Road Guy Rob's video on ramp meters. He explains why having the ramp meters on is still useful. The quick explanation is that it does theoretically still help to end the traffic jam sooner.

But a theory isn't the same thing as it actually happening.
Title: Re: The Ramp Meter Thread
Post by: Ted$8roadFan on October 07, 2022, 01:28:23 PM
There's this relatively new one at the junction of the Garden State Parkway and the NY Thruway in Nanuet, NY.

https://maps.app.goo.gl/Mzqssp3uZRGyRGV38?g_st=ic
Title: Re: The Ramp Meter Thread
Post by: 1995hoo on October 07, 2022, 01:36:46 PM
I'm mildly curious as to when everyone first saw ramp meters. Around here, the first ones to be installed (and thus the first ones I ever remember seeing) were on I-66 inside the Beltway; the signals were in place when that segment of road opened in December 1982 a few days before Christmas, but they weren't actually turned on for another year or two because Arlington County expressed concern about whether they would cause traffic to back up onto the streets feeding the onramps. At the time, I-66 carried a rush-hour-only peak-direction HOV-4 restriction (reduced to HOV-3 within the first year after opening), so the road got so little traffic during rush hour that the county's concerns proved unfounded at that time.

I don't believe people generally called them "ramp meters" back then, though.
Title: Re: The Ramp Meter Thread
Post by: roadman65 on October 13, 2022, 08:59:17 AM
Quote from: Ted$8roadFan on October 07, 2022, 01:28:23 PM
There's this relatively new one at the junction of the Garden State Parkway and the NY Thruway in Nanuet, NY.

https://maps.app.goo.gl/Mzqssp3uZRGyRGV38?g_st=ic

That's odd. Ramp meters are usually installed on local arterials or residential roads entering a freeway. This is a freeway to freeway connection here.
Title: Re: The Ramp Meter Thread
Post by: Ted$8roadFan on October 13, 2022, 10:07:26 AM
Quote from: roadman65 on October 13, 2022, 08:59:17 AM
Quote from: Ted$8roadFan on October 07, 2022, 01:28:23 PM
There's this relatively new one at the junction of the Garden State Parkway and the NY Thruway in Nanuet, NY.

https://maps.app.goo.gl/Mzqssp3uZRGyRGV38?g_st=ic

That's odd. Ramp meters are usually installed on local arterials or residential roads entering a freeway. This is a freeway to freeway connection here.

I'm guessing that this one exists because there is so much interstate car traffic using the Garden State Parkway and the Westchester highways to avoid NYC.
Title: Re: The Ramp Meter Thread
Post by: JoePCool14 on October 14, 2022, 10:21:19 AM
A follow-up on my earlier post:

Quote from: JoePCool14 on October 07, 2022, 11:51:44 AM
My favorite ramp meter is actually the one near my office at Cumberland. There's the typical Ramp Meter Ahead warning sign, and the ramp is stripped like one I posted above. The thing is, the meter is so good that it never turns red and is actually invisible. Really impressive and innovative.

https://goo.gl/maps/q2Vw3i243zeG6FZv6

I left yesterday to see new detection lines cut in at multiple locations on the ramp. I have a feeling the invisible meter may become visible soon. I'll keep you posted.
Title: Re: The Ramp Meter Thread
Post by: wanderer2575 on October 19, 2022, 10:51:51 AM
A few ramp meters were installed along I-94 in downtown Detroit about 20 years ago.  They lasted only a few years, if that long, before being removed.

(https://i.imgur.com/ngy5Agp.jpg)
Title: Re: The Ramp Meter Thread
Post by: Scott5114 on October 26, 2022, 01:09:24 PM
I've never used a metered ramp, so this is probably a dumb question, but... do they make it as hard to get up to speed to join the freeway as they seem like they would? Or are they only ever used in situations where the traffic on the mainline is running slow enough that you don't really need to worry about the speed differential?
Title: Re: The Ramp Meter Thread
Post by: 6a on October 26, 2022, 04:50:11 PM
Quote from: Scott5114 on October 26, 2022, 01:09:24 PM
I've never used a metered ramp, so this is probably a dumb question, but... do they make it as hard to get up to speed to join the freeway as they seem like they would? Or are they only ever used in situations where the traffic on the mainline is running slow enough that you don't really need to worry about the speed differential?
Here in Columbus they're usually turned on when there's congestion. It's almost a way of forcing a zipper merge by spacing out traffic entering the freeway. And they do vary the length of a red light depending on mainline speeds.
Title: Re: The Ramp Meter Thread
Post by: froggie on October 26, 2022, 04:58:55 PM
Quote from: Scott5114 on October 26, 2022, 01:09:24 PM
I've never used a metered ramp, so this is probably a dumb question, but... do they make it as hard to get up to speed to join the freeway as they seem like they would? Or are they only ever used in situations where the traffic on the mainline is running slow enough that you don't really need to worry about the speed differential?

In fairness, they do make it harder to get up to speed because of where they're located.  The trade-off is they improve speed on the mainline because you don't have a whole platoon of vehicles merging from the on-ramp at the same time.
Title: Re: The Ramp Meter Thread
Post by: fwydriver405 on October 26, 2022, 07:23:14 PM
Quote from: roadman65 on October 07, 2022, 12:17:31 PM
What I like is no wasted yellow section as Caltrans and Oregon both seem to have full heads despite the yellow is not used.

I think in CA, yellow is used as the warning for the last car if the meter allows 2 or 3 cars per green (Example 1 (https://youtu.be/lcAg1TwiRZM?t=1038), Example 2 (https://www.youtube.com/watch?v=y5VfSFJ2Pw4)).  Last time I was in SoCal in 2015, 2 cars/green was common in southern Orange County and the San Diego area. It's typically not used for one car per green meters, though I have sometimes seen the yellow activate in this example (https://youtu.be/nHaAZVODURA?t=306). Utah does something similar too for their 2 or 3 per green meters.

Also, in CA, ramp meters that activate from a dark state (https://youtu.be/7q-P9-VQ8Y4?t=28) start off with a green ball for a few seconds, then a yellow clearance before a full red, and then the meter cycles as usual.

Minnesota and Denver (https://youtu.be/S2a9vhLJD7U?t=58) uses the yellow section as flashing when inactive. When active, in MN (not sure about CO), the yellow does activate even for 1 car/green signals after the vehicle pulls away from the stop line (https://youtu.be/rsvaGXW6moA?t=340).

EDIT: Some older San Diego meters (https://youtu.be/iiQ2OKjezJw?t=33) still have the 3-2 signal head setup, which leads to situations where the top three section signal goes yellow but the two section stays green until both are red on startup.
Title: Re: The Ramp Meter Thread
Post by: JoePCool14 on October 26, 2022, 07:29:58 PM
Quote from: Scott5114 on October 26, 2022, 01:09:24 PM
I've never used a metered ramp, so this is probably a dumb question, but... do they make it as hard to get up to speed to join the freeway as they seem like they would? Or are they only ever used in situations where the traffic on the mainline is running slow enough that you don't really need to worry about the speed differential?

If they're placed in the correct location, there shouldn't be too much trouble getting up to speed before the end of the acceleration lane. Generally though, the traffic is going a bit slower than normal, so that helps makes the process easier anyways.
Title: Re: The Ramp Meter Thread
Post by: Bruce on November 01, 2022, 06:21:50 PM
Quote from: Scott5114 on October 26, 2022, 01:09:24 PM
I've never used a metered ramp, so this is probably a dumb question, but... do they make it as hard to get up to speed to join the freeway as they seem like they would? Or are they only ever used in situations where the traffic on the mainline is running slow enough that you don't really need to worry about the speed differential?

In heavy traffic, no.

But when the meter is on but traffic is flowing at somewhat normal speeds, it can be pretty difficult. Getting stuck behind a slow-moving vehicle that tries to merge at 30 mph into 60 mph traffic is real fun.
Title: Re: The Ramp Meter Thread
Post by: US 89 on November 01, 2022, 10:26:34 PM
Quote from: Bruce on November 01, 2022, 06:21:50 PM
Quote from: Scott5114 on October 26, 2022, 01:09:24 PM
I've never used a metered ramp, so this is probably a dumb question, but... do they make it as hard to get up to speed to join the freeway as they seem like they would? Or are they only ever used in situations where the traffic on the mainline is running slow enough that you don't really need to worry about the speed differential?

In heavy traffic, no.

But when the meter is on but traffic is flowing at somewhat normal speeds, it can be pretty difficult. Getting stuck behind a slow-moving vehicle that tries to merge at 30 mph into 60 mph traffic is real fun.

Yeah, but people merge like that regardless of whether there is a meter or not...
Title: Re: The Ramp Meter Thread
Post by: roadfro on November 03, 2022, 12:29:21 PM
Quote from: froggie on October 26, 2022, 04:58:55 PM
Quote from: Scott5114 on October 26, 2022, 01:09:24 PM
I've never used a metered ramp, so this is probably a dumb question, but... do they make it as hard to get up to speed to join the freeway as they seem like they would? Or are they only ever used in situations where the traffic on the mainline is running slow enough that you don't really need to worry about the speed differential?

In fairness, they do make it harder to get up to speed because of where they're located.  The trade-off is they improve speed on the mainline because you don't have a whole platoon of vehicles merging from the on-ramp at the same time.

It really depends on where the meter is located and how the ramp and merge are designed. If everything is engineered well, you'd have a sufficiently long ramp that either has a long merge taper or feeds into an added/auxiliary lane(s) on the freeway, with the meter being placed about halfway to two-thirds of the way down the ramp–such that there is sufficient storage space on the ramp to prevent queue spillback onto the arterial street, but also allows sufficient distance to accelerate to freeway speed after stopping at the meter prior to vehicles needing to merge to the mainline. Often, meters on older ramps (often added well after initial construction) are placed much closer to the gore point and the ramp lacks sufficient acceleration space, making merging from those meters when the freeway traffic is at normal speed much tougher.
Title: Re: The Ramp Meter Thread
Post by: MASTERNC on December 08, 2022, 03:27:20 PM
Saw a weird sequence on I-476 outside Philly today.  I know they have been doing upgrade work on the ramp meters but not sure if this is a temporary setup for off-peak hours.

Just before 3 PM, the meters at the US 1 on-ramps were flashing red (alternating between the left and right signals).  There were no vehicles on the meter I could see, so not sure if they even got a green signal.  Not sure the point of a flashing red or if it is even legal for ramp meters.
Title: Re: The Ramp Meter Thread
Post by: Ted$8roadFan on December 08, 2022, 05:19:40 PM
Quote from: MASTERNC on December 08, 2022, 03:27:20 PM
Saw a weird sequence on I-476 outside Philly today.  I know they have been doing upgrade work on the ramp meters but not sure if this is a temporary setup for off-peak hours.

Just before 3 PM, the meters at the US 1 on-ramps were flashing red (alternating between the left and right signals).  There were no vehicles on the meter I could see, so not sure if they even got a green signal.  Not sure the point of a flashing red or if it is even legal for ramp meters.

They have ramp meters on the Blue Route? That's a change.
Title: Re: The Ramp Meter Thread
Post by: MASTERNC on December 08, 2022, 07:22:49 PM
Quote from: Ted$8roadFan on December 08, 2022, 05:19:40 PM
Quote from: MASTERNC on December 08, 2022, 03:27:20 PM
Saw a weird sequence on I-476 outside Philly today.  I know they have been doing upgrade work on the ramp meters but not sure if this is a temporary setup for off-peak hours.

Just before 3 PM, the meters at the US 1 on-ramps were flashing red (alternating between the left and right signals).  There were no vehicles on the meter I could see, so not sure if they even got a green signal.  Not sure the point of a flashing red or if it is even legal for ramp meters.

They have ramp meters on the Blue Route? That's a change.

They do but their use is inconsistent.  Some were off for a long time until recently but others have been used continuously on the 4-lane section. 
Title: Re: The Ramp Meter Thread
Post by: hbelkins on December 09, 2022, 09:39:30 AM
Quote from: Ted$8roadFan on December 08, 2022, 05:19:40 PM
Quote from: MASTERNC on December 08, 2022, 03:27:20 PM
Saw a weird sequence on I-476 outside Philly today.  I know they have been doing upgrade work on the ramp meters but not sure if this is a temporary setup for off-peak hours.

Just before 3 PM, the meters at the US 1 on-ramps were flashing red (alternating between the left and right signals).  There were no vehicles on the meter I could see, so not sure if they even got a green signal.  Not sure the point of a flashing red or if it is even legal for ramp meters.

They have ramp meters on the Blue Route? That's a change.

Actually, that's the first place I ever encountered one.
Title: Re: The Ramp Meter Thread
Post by: zachary_amaryllis on December 18, 2022, 09:02:33 AM
Quote from: Scott5114 on October 26, 2022, 01:09:24 PM
I've never used a metered ramp, so this is probably a dumb question, but... do they make it as hard to get up to speed to join the freeway as they seem like they would? Or are they only ever used in situations where the traffic on the mainline is running slow enough that you don't really need to worry about the speed differential?
To me, they make absolutely no sense, but I also don't regularly drive in rush-hour urban traffic, so I'll defer to others' experience/knowledge on it.

It feels to me, like, the one time you want your foot firmly planted, so as to make a sane merge, instead they make you stop. Some people in Denver think of it like a drag race, and it really is, since the ramps generally narrow to one lane before the gore point. For me, I'd just let the other car go, unless it's a VW bus or something. But if the meter is active, I'm probably not going to be merging into smooth traffic, either.

But, I also get there's people more qualified on it than I, and that there are probably reasons beyond what I see, for these. I know they're starting to pop up outside Denver as well - there's one where US 40 joins I-70 at Empire, and there's one here in Fort Collins, on the SB ramp to I-25 from Harmony. Isn't there one at Carpenter, also (jlam?)
Title: Re: The Ramp Meter Thread
Post by: jeffandnicole on December 18, 2022, 09:24:45 AM
Quote from: Ted$8roadFan on December 08, 2022, 05:19:40 PM
Quote from: MASTERNC on December 08, 2022, 03:27:20 PM
Saw a weird sequence on I-476 outside Philly today.  I know they have been doing upgrade work on the ramp meters but not sure if this is a temporary setup for off-peak hours.

Just before 3 PM, the meters at the US 1 on-ramps were flashing red (alternating between the left and right signals).  There were no vehicles on the meter I could see, so not sure if they even got a green signal.  Not sure the point of a flashing red or if it is even legal for ramp meters.

They have ramp meters on the Blue Route? That's a change.

Since 2010, and the article states some ramps had them upwards of 10 years prior to that. https://www.google.com/amp/s/www.mainlinemedianews.com/2010/02/03/blue-route-ramps-to-be-metered/amp/
Title: Re: The Ramp Meter Thread
Post by: JoePCool14 on December 19, 2022, 10:22:55 AM
Quote from: JoePCool14 on October 07, 2022, 12:30:23 PM
Quote from: kphoger on October 07, 2022, 12:07:10 PM
Quote from: JoePCool14 on October 07, 2022, 11:51:44 AM
My favorite ramp meter is actually the one near my office at Cumberland. There's the typical Ramp Meter Ahead warning sign, and the ramp is stripped like one I posted above. The thing is, the meter is so good that it never turns red and is actually invisible. Really impressive and innovative.

https://goo.gl/maps/q2Vw3i243zeG6FZv6

:biggrin:

https://goo.gl/maps/Ke9MucU6PXPPvo7Y8

They built new pads for new signals but never installed them. I might contact IDOT and ask them why. They definitely could use them here.

Another update: The actual ramp meters have finally been installed! I haven't seem them in action yet though. No green lights or anything so far.
Title: Re: The Ramp Meter Thread
Post by: jakeroot on December 25, 2022, 10:57:12 PM
Quote from: Bruce on November 01, 2022, 06:21:50 PM
when the meter is on but traffic is flowing at somewhat normal speeds, it can be pretty difficult. Getting stuck behind a slow-moving vehicle that tries to merge at 30 mph into 60 mph traffic is real fun.

I experienced this several times in Renton, at the 405/Bronson Way NE/Sunset Blvd on-ramp (northern exit 4 on-ramp (https://goo.gl/maps/fBM7c2hgkiWhhGJXA)). When I lived in Renton, it was on 24/7. That stretch of 405 was, to be fair, chronically congested, but it was always on, even during relatively quiet periods. Traffic did not always do a good job getting up to speed, despite having about a fifth of a mile to do so.
Title: Re: The Ramp Meter Thread
Post by: Bruce on December 26, 2022, 02:36:15 AM
Quote from: zachary_amaryllis on December 18, 2022, 09:02:33 AM
Quote from: Scott5114 on October 26, 2022, 01:09:24 PM
I've never used a metered ramp, so this is probably a dumb question, but... do they make it as hard to get up to speed to join the freeway as they seem like they would? Or are they only ever used in situations where the traffic on the mainline is running slow enough that you don't really need to worry about the speed differential?
To me, they make absolutely no sense, but I also don't regularly drive in rush-hour urban traffic, so I'll defer to others' experience/knowledge on it.

It feels to me, like, the one time you want your foot firmly planted, so as to make a sane merge, instead they make you stop. Some people in Denver think of it like a drag race, and it really is, since the ramps generally narrow to one lane before the gore point. For me, I'd just let the other car go, unless it's a VW bus or something. But if the meter is active, I'm probably not going to be merging into smooth traffic, either.

But, I also get there's people more qualified on it than I, and that there are probably reasons beyond what I see, for these. I know they're starting to pop up outside Denver as well - there's one where US 40 joins I-70 at Empire, and there's one here in Fort Collins, on the SB ramp to I-25 from Harmony. Isn't there one at Carpenter, also (jlam?)

Being stuck in the right lane on the freeway (mostly to make a merge to the next exit) makes these meters matter a lot. By spreading out the clump of traffic trying to enter the freeway from a signal change, it becomes more predictable and can smooth out its effect on congestion. As a bonus, some of them have bypasses for buses and carpools, which encourages those uses.
Title: Re: The Ramp Meter Thread
Post by: zachary_amaryllis on December 26, 2022, 05:18:49 AM
Quote from: Bruce on December 26, 2022, 02:36:15 AM
Quote from: zachary_amaryllis on December 18, 2022, 09:02:33 AM
Quote from: Scott5114 on October 26, 2022, 01:09:24 PM
I've never used a metered ramp, so this is probably a dumb question, but... do they make it as hard to get up to speed to join the freeway as they seem like they would? Or are they only ever used in situations where the traffic on the mainline is running slow enough that you don't really need to worry about the speed differential?
To me, they make absolutely no sense, but I also don't regularly drive in rush-hour urban traffic, so I'll defer to others' experience/knowledge on it.

It feels to me, like, the one time you want your foot firmly planted, so as to make a sane merge, instead they make you stop. Some people in Denver think of it like a drag race, and it really is, since the ramps generally narrow to one lane before the gore point. For me, I'd just let the other car go, unless it's a VW bus or something. But if the meter is active, I'm probably not going to be merging into smooth traffic, either.

But, I also get there's people more qualified on it than I, and that there are probably reasons beyond what I see, for these. I know they're starting to pop up outside Denver as well - there's one where US 40 joins I-70 at Empire, and there's one here in Fort Collins, on the SB ramp to I-25 from Harmony. Isn't there one at Carpenter, also (jlam?)

Being stuck in the right lane on the freeway (mostly to make a merge to the next exit) makes these meters matter a lot. By spreading out the clump of traffic trying to enter the freeway from a signal change, it becomes more predictable and can smooth out its effect on congestion. As a bonus, some of them have bypasses for buses and carpools, which encourages those uses.
I've seen the bypass lanes in use. I suspect cheating these could be a thing, lord knows I was tempted.
Title: Re: The Ramp Meter Thread
Post by: Lukeisroads on January 07, 2023, 08:25:37 AM
ok weve hung this thread out for too long we have to bring this thread back like for example i have three ramp meters that arent setup like
https://www.google.com/maps/@35.411619,-119.0546939,3a,15y,135.44h,87.66t/data=!3m7!1e1!3m5!1sT0wNagFAPKyxODLrtrYfcg!2e0!6shttps:%2F%2Fstreetviewpixels-pa.googleapis.com%2Fv1%2Fthumbnail%3Fpanoid%3DT0wNagFAPKyxODLrtrYfcg%26cb_client%3Dmaps_sv.tactile.gps%26w%3D203%26h%3D100%26yaw%3D167.66911%26pitch%3D0%26thumbfov%3D100!7i16384!8i8192
Note:this one has been standing since the early 2010s.
This one has DOUBLE Back lights
https://www.google.com/maps/@35.3528799,-119.022714,3a,75y,223.87h,90.28t/data=!3m6!1e1!3m4!1se1fX8xgF8QaVKgQUBXEMcw!2e0!7i16384!8i8192
https://www.google.com/maps/@35.3368998,-119.0400416,3a,15y,177.36h,91.49t/data=!3m7!1e1!3m5!1s4cavBnoB8vAWeqivVCa4Zg!2e0!6shttps:%2F%2Fstreetviewpixels-pa.googleapis.com%2Fv1%2Fthumbnail%3Fpanoid%3D4cavBnoB8vAWeqivVCa4Zg%26cb_client%3Dmaps_sv.tactile.gps%26w%3D203%26h%3D100%26yaw%3D314.12994%26pitch%3D0%26thumbfov%3D100!7i16384!8i8192
This has been standing since the ming ave redesign
Title: Re: The Ramp Meter Thread
Post by: skluth on January 07, 2023, 02:25:41 PM
Quote from: zachary_amaryllis on December 26, 2022, 05:18:49 AM
Quote from: Bruce on December 26, 2022, 02:36:15 AM
Quote from: zachary_amaryllis on December 18, 2022, 09:02:33 AM
Quote from: Scott5114 on October 26, 2022, 01:09:24 PM
I've never used a metered ramp, so this is probably a dumb question, but... do they make it as hard to get up to speed to join the freeway as they seem like they would? Or are they only ever used in situations where the traffic on the mainline is running slow enough that you don't really need to worry about the speed differential?
To me, they make absolutely no sense, but I also don't regularly drive in rush-hour urban traffic, so I'll defer to others' experience/knowledge on it.

It feels to me, like, the one time you want your foot firmly planted, so as to make a sane merge, instead they make you stop. Some people in Denver think of it like a drag race, and it really is, since the ramps generally narrow to one lane before the gore point. For me, I'd just let the other car go, unless it's a VW bus or something. But if the meter is active, I'm probably not going to be merging into smooth traffic, either.

But, I also get there's people more qualified on it than I, and that there are probably reasons beyond what I see, for these. I know they're starting to pop up outside Denver as well - there's one where US 40 joins I-70 at Empire, and there's one here in Fort Collins, on the SB ramp to I-25 from Harmony. Isn't there one at Carpenter, also (jlam?)

Being stuck in the right lane on the freeway (mostly to make a merge to the next exit) makes these meters matter a lot. By spreading out the clump of traffic trying to enter the freeway from a signal change, it becomes more predictable and can smooth out its effect on congestion. As a bonus, some of them have bypasses for buses and carpools, which encourages those uses.
I've seen the bypass lanes in use. I suspect cheating these could be a thing, lord knows I was tempted.

I see far more cheating in the HOV freeway lanes than the HOV lanes on metered ramps. But I rarely see the meters backed up more than 6-8 cars when I've used them. I think they work pretty decently because, like others have stated, they reduce the flow problems caused by multiple vehicles trying to merge onto a busy freeway simultaneously. The wait is annoying but it's no worse than being stopped at a regular street light waiting to enter a freeway. I see them mostly on inclines as freeways more often cross other roads than the reverse but that may be more a factor of my own driving choices than reality. It is a pain when you need to stop and start again on those inclines but I think it's more an issue with slower accelerating vehicles (whether due to mass like a semi or drivers who don't understand why its called an acceleration lane) than most passenger vehicles.

We have several ramp meters in the Coachella Valley. There may also be some through San Gorgonio Pass. I've never seen them in use in either area. They might be used around big events like the music festivals and the BNP but I avoid driving on I-10 during those events.
Title: Re: The Ramp Meter Thread
Post by: kirbykart on January 07, 2023, 02:46:37 PM
Quote from: Lukeisroads on January 07, 2023, 08:25:37 AM
ok weve hung this thread out for too long we have to bring this thread back like for example i have three ramp meters that arent setup like

Bring it back to what? What does that even mean to begin with? Weren't you the one who simply demanded us to post examples of ramp meters? There was no further detail. What are you talking about?
Title: Re: The Ramp Meter Thread
Post by: Scott5114 on January 07, 2023, 07:28:53 PM
Quote from: Lukeisroads on January 07, 2023, 08:25:37 AM
ok weve hung this thread out for too long we have to bring this thread back

We don't have to do jack shit. That sounds a lot like bumping a thread for the sake of bumping a thread.