One-aspect traffic lights (aka "perpetual green light")

Started by KCRoadFan, February 13, 2022, 11:45:37 PM

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Dirt Roads

Quote from: MASTERNC on October 24, 2022, 04:08:20 PM
There were a few heading up and down the hill from Charleston Airport the last time I was there.  Most of the bypass lanes were going downhill.

https://goo.gl/maps/as637zYPmJmfVRAq8

Those had Bots Dots back in the day, as well. 

Fun fact:  Going northbound from there on Greenbrier Street (then) WV-14 (now WV-114), the left-turn lane for the unsignalized entrance to (then) Kanawha Airport (now Yeager Airport) had Bots Dots everywhere, separating all of the lane movements.  The Bots Dots are long gone, but amazingly the airport entrance is still unsignalized (as most of the traffic on Greenbrier Street is headed for the Airport, the Air National Guard barracks, or Coonskin Park.


mrsman

Quote from: Quillz on October 21, 2022, 04:44:34 PM
One just got installed right by LAX. Sepulveda/92nd now has a signal light, but only the southbound lanes on Sepulveda interact with 92nd. The northbound lanes have a perpetual green, although it's a typical signal light, not a single bulb. However, it did break down not too long ago so I did have to stop there once since it was flashing red.

For curiosity, I went to check it out on GSV:

https://www.google.com/maps/@33.9533861,-118.3964963,3a,15y,79.21h,91.78t/data=!3m6!1e1!3m4!1sJxMOJCT_bBCxCUYsPVlgLA!2e0!7i16384!8i8192


This is not a perpetual green signal.  It is true that when 92nd street traffic gets a green light, only soutbhound traffic gets a red.  Northbound traffic is unaffected by 92nd st vehicular traffic.  But northbound traffic will get a red light, if a pedestrian pushes the button to cross Sepulveda.  Northbouund traffic sees a green straight arrow, instead of a green orb, to denote that no turns are permitted onto 92nd.

I'm also curious about the 4 aspects facing 92nd.  Traffic on 92nd may only turn right.  Perhaps, this is a 4-aspect FYA signal that displays a green arrow when pedestrians have not pressed the button; a flashing yellow arrow to denote yielding to pedestrians who have pressed the button, a solid yellow arrow (or orb) to denote the signal transitioning to red; and a red orb which (in CA) would allow for a right turn on red.

CA usually singalizes a perpetual green with a single aspect light.  This is not a perpetual green.

Mr. Matté

Here's a weird one on PA 512 southbound in Pen Argyl, PA:


The green right arrow is on all the time and the red ball at the top flashes. However, you can't actually continue straight on Main Street here per signage and past pavement markings. The flashing red ball would seem that you should stop before proceeding (the famous PennDOT "STOP except right turns") so the meaning conflicts with the signage (not that it's a standard traffic light setup anyway).

webny99

^ Wow, that is bizarre. I think that even tops the one I saw in Elizabeth, NJ the other day at Trumbull St and Dowd Ave. It looks similar at face value, but the straight through prohibition in your example combined with the flashing red balls and permanent green arrow is next level.

jakeroot

Both that Pen Argyl, PA and Elizabeth, NJ examples seem to conflict with pedestrian crossings. The Elizabeth example is particular egregious as the crosswalk is painted.

kphoger

Keep right except to pass.  Yes.  You.
Visit scenic Orleans County, NY!
Male pronouns, please.

Quote from: Philip K. DickIf you can control the meaning of words, you can control the people who must use them.

CovalenceSTU

Since the thread's been resurrected, here's the two I know of in NW Oregon:

"4"-way beacon (flashing red in three directions and yellow in one) with a perpetual right turn arrow in Vernonia:

It replaced an older setup that used a single signal for both (although 2007 GSV quality is abysmal)


Perpetual green for a protected left onto the St. Johns Bridge in Portland:

Hobart

Quote from: kphoger on March 15, 2023, 10:15:40 AM
Just found this one on the north side of Monee, IL:  https://goo.gl/maps/D2ecZxawQKLunbjS8

This is actually my first experience with this kind of signal, when I was like... four. I grew up in the area.
This is my signature. There are many like it, but this one is mine.

jtespi

Quote from: CovalenceSTU on March 15, 2023, 02:25:47 PM
Since the thread's been resurrected, here's the two I know of in NW Oregon:

"4"-way beacon (flashing red in three directions and yellow in one) with a perpetual right turn arrow in Vernonia:


I'd say that perpetual right green arrow should instead be a flashing yellow arrow. Right turning traffic doesn't get their own lane and there's an implied yield with that right turn cut.

So if a car from the left already stopped and is proceeding through the intersection you must give right of way to them, which is not what a green arrow means. A green arrow means you always have the right of way; in this location, that isn't always the case.

vdeane

I've seen enough all-but-one way stops for it to not be unplausible that other movements are supposed to wait for the right turn traffic on that slip ramp.
Please note: All comments here represent my own personal opinion and do not reflect the official position of NYSDOT or its affiliates.

D-Dey65

Quote from: rickmastfan67 on April 05, 2022, 03:56:05 AM
Quote from: ran4sh on February 17, 2022, 01:13:19 AM
Florida seems to have decided to remove those continuous green type intersections statewide, there are some I remember in Jacksonville from the early 2010s that are not that way anymore according to GSV.

There's still at least 3 in Jacksonville along US-17 per StreetView.
US-17 (North Main Street)/Baisden Road (March '21)
US-17 (North Main Street)/Imeson Park Blvd (February '22)
US-17 (North Main Street)/Zoo Pkwy (January '22)
Well, if you want US 17, there's at least one northbound lane with a permanent green arrow in Palatka.
https://www.google.com/maps/@29.6685228,-81.6566204,3a,75y,349.39h,87.49t/data=!3m6!1e1!3m4!1sLS3pFfauXllibGCldYjU4w!2e0!7i16384!8i8192?hl=en&entry=ttu

jakeroot

Quote from: vdeane on June 06, 2023, 08:59:39 PM
I've seen enough all-but-one way stops for it to not be unplausible that other movements are supposed to wait for the right turn traffic on that slip ramp.

I would have assumed this was the case as well. The white painted island seems to be nothing more than just a flush island to help guide traffic through the turn, though still keeping it as part of the whole intersection. Unlike typical slip lanes that are technically separate movements that never have right-of-way.

It's not even that uncommon for slip lanes to have right-of-way over the "straight" movement. Example in Burien, WA; Bellingham, WA. Both of these are much wider than that Oregon example, but the point is just that slip lanes can have priority.

D-Dey65

Quote from: rickmastfan67 on April 05, 2022, 03:56:05 AM
Quote from: ran4sh on February 17, 2022, 01:13:19 AM
Florida seems to have decided to remove those continuous green type intersections statewide, there are some I remember in Jacksonville from the early 2010s that are not that way anymore according to GSV.

There's still at least 3 in Jacksonville along US-17 per StreetView.
US-17 (North Main Street)/Baisden Road (March '21)
US-17 (North Main Street)/Imeson Park Blvd (February '22)
US-17 (North Main Street)/Zoo Pkwy (January '22)
Hey, I found another perpetual green signal related to US 17; Westbound on US 92 at the west end of the US 17-92 overlap in Lake Alfred;
https://www.google.com/maps/@28.0758235,-81.7326612,3a,75y,230.88h,89.59t/data=!3m6!1e1!3m4!1s11Gz0V1XLGQtJhgzQc8OEg!2e0!7i16384!8i8192?hl=en&entry=tt

Mergingtraffic

Waterbury, CT has this, a full traffic light with RED and YELLOW and an eternal GREEN. But, the red nd yellow are never on. There's no need for them to be.

https://www.google.com/maps/@41.5495861,-73.0273133,3a,75y,357.96h,92.26t/data=!3m6!1e1!3m4!1s9NfyMRXKmToIR-Ykuww7vw!2e0!7i16384!8i8192?hl=en&entry=ttu
I only take pics of good looking signs. Long live non-reflective button copy!
MergingTraffic https://www.flickr.com/photos/98731835@N05/

Big John

^^ That is standard operating procedure in Wisconsin.

roadman65

Quote from: Mergingtraffic on August 08, 2023, 08:57:02 PM
Waterbury, CT has this, a full traffic light with RED and YELLOW and an eternal GREEN. But, the red nd yellow are never on. There's no need for them to be.

https://www.google.com/maps/@41.5495861,-73.0273133,3a,75y,357.96h,92.26t/data=!3m6!1e1!3m4!1s9NfyMRXKmToIR-Ykuww7vw!2e0!7i16384!8i8192?hl=en&entry=ttu

Louisiana has one on US 90 EB at I-310 NB.  The red and yellow never operate as it's a T intersection with a one way ramp so traffic never needs to stop.
Every day is a winding road, you just got to get used to it.

Sheryl Crowe

chrisg69911

Quote from: bzakharin on August 10, 2022, 05:56:01 PM
I don't think NJ has any true examples. I've seen flashing yellow and red lights at an intersection reinforcing the stop signs, but those aren't true traffic lights.  https://www.google.com/maps/@39.531376,-75.1071113,3a,75y,275.47h,87.98t/data=!3m6!1e1!3m4!1sLvCJRCgy2jRUvFE34mx2lQ!2e0!7i16384!8i8192!5m1!1e1
There is also an intersection with a permanent red, but it has a regular traffic light where the red is always on and the green ball replaced with a green left arrow.
https://www.google.com/maps/@39.9371042,-74.9699042,3a,75y,33.71h,84.61t/data=!3m7!1e1!3m5!1swwKmJ-q6nX2Ue9p52UGTqg!2e0!5s20160901T000000!7i13312!8i6656!5m1!1e1

Weehawken has one on 495 West on ramp/street



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