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Traffic signal

Started by Tom89t, January 14, 2012, 01:01:45 AM

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STLmapboy

Quote from: jakeroot on October 01, 2020, 01:05:38 AM
Quote from: STLmapboy on September 30, 2020, 12:08:56 PM
OK, this you've got to see.

I guess the mast on the left wasn't good enough?? And the height?? :crazy:

That seems like it would blow over in a gust of wind.
Here's another doghouse oddity a few miles away.
Teenage STL area roadgeek.
Missouri>>>>>Illinois


Amtrakprod

Quote from: STLmapboy on September 26, 2020, 03:06:56 PM
It's kinda hard to see, but this doghouse has two green arrows instead of a green ball/green arrow. Of course, now that the new Ellis Road is completed, this has probably gone away.
Similar to this:
https://www.google.com/maps/@42.3692686,-71.1171894,3a,31.7y,211.86h,92.34t/data=!3m6!1e1!3m4!1sGHI-_R3gDL5neC5F74DGoQ!2e0!7i16384!8i8192
Roadgeek, railfan, and crossing signal fan. From Massachusetts, and in high school. Youtube is my website link. Loves FYAs signals. Interest in Bicycle Infrastructure. Owns one Leotech Pedestrian Signal, and a Safetran Type 1 E bell.

jakeroot

Quote from: Amtrakprod on October 01, 2020, 08:53:12 AM
MA traffic lights near me:
this , this , this , this , and this .

Very clean installs! I like how Mass is willing to consider the individual nuances of each intersection when considering where to place signals, rather than a one size-fits all approach that you see in most places. This could easily become a bad thing if misused (i.e. not doing enough or making a mess of signal placement), but that generally doesn't seem to happen in Mass.

jakeroot

#3428
Quote from: paulthemapguy on October 01, 2020, 09:57:40 AM
Possibly bad signal placement...why don't they put the relevant signals facing the sidestreet on the mast arm coming from the left?  https://goo.gl/maps/KAmd65KTKKpW2miD9

I think if it were on the mast arm from the left, they'd be too close to the stop line and thus not within the required cone of vision. They only just barely seem to be within the cone of vision as placed, although the signals on the other mast arm might actually be blocking the vision of the signals on the "further" mast arm...that's a really mess setup!!

Easiest thing would have been to have shorter mast arms, with the doghouse on the far left of the mast arm, and the through signal on the mast itself. But what do I know....

SignBridge

While I like either the side-by-side arrangement or a vertical 5-stack for overhead signals, I think post mounted signals look better (neater, cleaner) with a vertical stack. Just my preference

STLmapboy

This is unusual in Virginia. Double-red arrows. Also seen some in MD.
Teenage STL area roadgeek.
Missouri>>>>>Illinois

Amtrakprod

Roadgeek, railfan, and crossing signal fan. From Massachusetts, and in high school. Youtube is my website link. Loves FYAs signals. Interest in Bicycle Infrastructure. Owns one Leotech Pedestrian Signal, and a Safetran Type 1 E bell.

STLmapboy

This may well be the thickest span wire support pole you ever see. Also note the gantry holding up signals on SR-46 WB. Indiana is an interesting place.
Teenage STL area roadgeek.
Missouri>>>>>Illinois

jakeroot

Quote from: Amtrakprod on October 02, 2020, 06:57:20 AM
https://youtu.be/Zpnq0lp6OS0

That's pretty cool, although I'd prefer to see the FYA active only when there are pedestrians. Otherwise the distinction for drivers will be lost when the crosswalk is actually active.

Amtrakprod

Roadgeek, railfan, and crossing signal fan. From Massachusetts, and in high school. Youtube is my website link. Loves FYAs signals. Interest in Bicycle Infrastructure. Owns one Leotech Pedestrian Signal, and a Safetran Type 1 E bell.

thenetwork

Didn't get a chance to see how this one works, but this seems to be an answer to preventing crashes when the cross street makes a U-turn on a green left arrow.

https://goo.gl/maps/bv55twxR3BaNSeJw9

STLmapboy

Quote from: thenetwork on October 03, 2020, 12:01:30 PM
Didn't get a chance to see how this one works, but this seems to be an answer to preventing crashes when the cross street makes a U-turn on a green left arrow.

https://goo.gl/maps/bv55twxR3BaNSeJw9
From 2007, 11, and 15 GSV, it looks like the four aspect signal is (from top to bottom):
Red
Red arrow
Yellow
Green
Teenage STL area roadgeek.
Missouri>>>>>Illinois

jakeroot

Quote from: thenetwork on October 03, 2020, 12:01:30 PM
Didn't get a chance to see how this one works, but this seems to be an answer to preventing crashes when the cross street makes a U-turn on a green left arrow.

https://goo.gl/maps/bv55twxR3BaNSeJw9

That's an option, to prevent RTOR specifically when U-turns are occurring. But that may not always be necessary. Something that allows traffic to move but intuitively tells traffic to watch for U-turns at the same time seems to be the ideal approach. Regular RTOR isn't great because traffic doesn't really know where to look, but another specific signal could be designed to do this. Like a flashing right yellow arrow with a supplemental "yield to U-turns on FYA" sign.

ErmineNotyours

Saw this today.  On a T intersection, the green balls seem redundant.  Except by providing them, the city or county doesn't have to provide two right turn signals.

roadfro

Quote from: ErmineNotyours on October 03, 2020, 09:38:39 PM
Saw this today.  On a T intersection, the green balls seem redundant.  Except by providing them, the city or county doesn't have to provide two right turn signals.

I see there is a crosswalk on the leg that left turning traffic would from this view would be using. I'd be interested to see what happens when the ped signal is activated...would the left green arrow from this approach still come on, or get the green ball without the arrow? (Or would there be no green entirely leaving an exclusive phase for the peds?)
Roadfro - AARoads Pacific Southwest moderator since 2010, Nevada roadgeek since 1983.

Amtrakprod

Quote from: ErmineNotyours on October 03, 2020, 09:38:39 PM
Saw this today.  On a T intersection, the green balls seem redundant.  Except by providing them, the city or county doesn't have to provide two right turn signals.

Looks good, but I'd take out the left turn arrow section on the left signal.
Roadgeek, railfan, and crossing signal fan. From Massachusetts, and in high school. Youtube is my website link. Loves FYAs signals. Interest in Bicycle Infrastructure. Owns one Leotech Pedestrian Signal, and a Safetran Type 1 E bell.

CJResotko


jakeroot

#3442
Quote from: roadfro on October 04, 2020, 02:42:16 PM
Quote from: ErmineNotyours on October 03, 2020, 09:38:39 PM
Saw this today.  On a T intersection, the green balls seem redundant.  Except by providing them, the city or county doesn't have to provide two right turn signals.

I see there is a crosswalk on the leg that left turning traffic would from this view would be using. I'd be interested to see what happens when the ped signal is activated...would the left green arrow from this approach still come on, or get the green ball without the arrow? (Or would there be no green entirely leaving an exclusive phase for the peds?)

The strangest thing about that signal, to me, is that the right signal does not appear to have a bimodal right-facing arrow. When the left turn from WLS Pkwy is on, there is no way for a green arrow to be active (unless the green arrow activated simultaneous with a lagging protected left, but even that might not end with terminating road getting a green light). That seems like an odd omission, especially if the right turn is busy enough to warrant placing the crosswalk across the left turn and that arrows were installed to begin with.

If that left turn across the crosswalk was a yield, the most basic setup for that turn would have been two green orbs for the approach for left and right turns, and a bimodal green/yellow arrow for the right turn.

I'll have to go up and check out the operation of the signal soon. I'm very interested.

STLmapboy

Teenage STL area roadgeek.
Missouri>>>>>Illinois

thenetwork


Mccojm

Quote from: STLmapboy on October 04, 2020, 06:10:54 PM
Quote from: CJResotko on October 04, 2020, 05:00:32 PM
Found this old 4-way signal with extended visors facing the side street and a 12-inch adapter.
https://www.google.com/maps/@41.8350323,-79.1284817,3a,18.7y,-2.63h,107.04t/data=!3m7!1e1!3m5!1srZA4lOOvBzl25kvJ6p2VRg!2e0!5s20081001T000000!7i13312!8i6656
That's the longest I've ever seen!

I think this tops longest tunnels ever on signal
https://goo.gl/maps/oZZWZjmcZafzyJ7X7
I believe they're 24"  and it's due to the severe skew of Jayne Blvd with busier ny-347. The tunnels are so long they act as wind sails and keep twisting the heads.

Here's more at NY-27 & Windsor Ave
https://goo.gl/maps/bkLp7c8RwEHnGdZ26
My expressed thoughts do not reflect those of NYSDOT, other associated agencies or firms.  Do not take anything I say as official unless it is released by said agencies.

NYSDOT R10 Long Island construction Group since 2013.

SignBridge

The ones on Rt. 347 are very long angle visors for angled cross streets. Agreed they are too long for free swinging signals. They were also used on Rt.110 at the first intersection south of Northern State Pkwy. But those appear to be installed incorrectly with the long side of the visor on top instead of to one side as per the angle of the intersection.

NYS DOT Region 10 is also on a backplate binge installing them on virtually all new and rebuilt signals lately. And just like 25 years ago, they are cracking and falling away within a few years of installation. Maybe they should use aluminum instead of plastic?




STLmapboy

Quote from: Mccojm on October 05, 2020, 01:27:33 PM
Quote from: STLmapboy on October 04, 2020, 06:10:54 PM
Quote from: CJResotko on October 04, 2020, 05:00:32 PM
Found this old 4-way signal with extended visors facing the side street and a 12-inch adapter.
https://www.google.com/maps/@41.8350323,-79.1284817,3a,18.7y,-2.63h,107.04t/data=!3m7!1e1!3m5!1srZA4lOOvBzl25kvJ6p2VRg!2e0!5s20081001T000000!7i13312!8i6656
That's the longest I've ever seen!

I think this tops longest tunnels ever on signal
https://goo.gl/maps/oZZWZjmcZafzyJ7X7
I believe they're 24"  and it's due to the severe skew of Jayne Blvd with busier ny-347. The tunnels are so long they act as wind sails and keep twisting the heads.

Here's more at NY-27 & Windsor Ave
https://goo.gl/maps/bkLp7c8RwEHnGdZ26
I should've clarified; longest non-angled visors. Cali has a lot of those twisted tunnels on their streets, though I've never seen an angled visor here in Missouri (we use programmables and louvers when the need arises).
Teenage STL area roadgeek.
Missouri>>>>>Illinois

mrsman

Quote from: jakeroot on October 03, 2020, 06:59:32 PM
Quote from: thenetwork on October 03, 2020, 12:01:30 PM
Didn't get a chance to see how this one works, but this seems to be an answer to preventing crashes when the cross street makes a U-turn on a green left arrow.

https://goo.gl/maps/bv55twxR3BaNSeJw9

That's an option, to prevent RTOR specifically when U-turns are occurring. But that may not always be necessary. Something that allows traffic to move but intuitively tells traffic to watch for U-turns at the same time seems to be the ideal approach. Regular RTOR isn't great because traffic doesn't really know where to look, but another specific signal could be designed to do this. Like a flashing right yellow arrow with a supplemental "yield to U-turns on FYA" sign.

It seems that Tuscon has the best answer for this.  Someone had posted on it a while ago (but I forget if it was here or in Mtn West forum).  Tucson has a 5 aspect RYG-YA-FYA signal.  Only when the corresponding left has green arrow - the right arrow displays a FYA as a warning to watch for u-turns.  When cross traffic has green, the right turn signal displays a normal red orb.

STLmapboy

Check out this four section PPLT in Virginia. Green ball in the yellow ball position.
Teenage STL area roadgeek.
Missouri>>>>>Illinois



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