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Author Topic: Traffic signal  (Read 288013 times)

NoGoodNamesAvailable

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Re: Traffic signal
« Reply #1725 on: June 14, 2018, 07:32:47 PM »

Bike signals should really only be used along two-way cycle tracks

Why? Most protected bike lanes in NYC are one-way.

Just seems like overkill. I like protected bike paths, but the single lane ones work fine with normal traffic lights. Two-way cycle paths? Those definitely need full protection. Honestly, I think one-way cycle paths are a waste of time. Just move all traffic to one side of the roadway, and use the extra space for a two-way path on the other side.

Images I've seen from NYC use FYA's against one-way cycle paths, so they really don't operate any different than a standard bike lane with green or blue paint through an intersection. In those instances, they'd be better off just switching the turn lanes and the bike lanes up several dozens of feet prior to an intersection, so the only conflict point is a brief switchover.

I'm going to beg to disagree. The unprotected "mixing zone" that NYC DOT uses is a death trap. You cannot expect drivers to yield to parallel bicycle traffic at speed, dozens of feet before an intersection—they just won't.

All intersections with a turn signal/bike signal treatment in NYC have a full turn protection phase for bicycles that usually switches to a permissive FYA. I can tell you from my own experience that even a short protected phase is a major improvement, similar to a leading pedestrian interval. Yielding behavior is much better when bicycles are allowed to establish themselves in the intersection before vehicles start turning.

One of my pet peeves is how NYC DOT ends the green paint at intersections and driveways—it seems awfully backward, painting the lane green where it's least useful then ending the paint where it's most needed.
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jakeroot

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Re: Traffic signal
« Reply #1726 on: June 14, 2018, 09:31:06 PM »

It looks to me as though New York City's design of the crossover point is quite poor. Minimal markings, and poor visibility thanks to parked cars. Just rectifying those two things could massively improve the situation, short of installing a two way cycle track.

If there was an opportunity to use a flashing yellow arrow against a bike lane, I would be fine with that (though I'd prefer a combo bike/ped signal). However, at least in Washington, only protected turns are allowed against cycle tracks (or at least that's all that's been used). I have never seen a protected-permissive turn against a cycle track.

By the way, your link is false advertising. No one died ;-). And it looks more like the car that was trying to go left was actually trying to park. They were turning far too sharp just to be turning left.
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MNHighwayMan

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Re: Traffic signal
« Reply #1727 on: June 15, 2018, 11:36:45 AM »

Couple other notes on that signal:

1) The right turn head may be in violation of MUTCD 4D.13 Paragraph 07.  Can't tell for sure, but based on Streetview it looks like they swapped out one of the through heads.

For an entirely different set of reasons, I actually have a picture of the old signal setup, and you are correct.

« Last Edit: June 15, 2018, 11:38:59 AM by MNHighwayMan »
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TBKS1

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Re: Traffic signal
« Reply #1728 on: June 16, 2018, 06:24:30 PM »



A weird/broken signal (Saint Louis, Missouri) by TheInstrumentalist, on Flickr

Saint Louis, Missouri - I took this about 2 weeks ago. This just looks weird.
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traffic light guy

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Re: Traffic signal
« Reply #1729 on: June 16, 2018, 10:46:37 PM »



A weird/broken signal (Saint Louis, Missouri) by TheInstrumentalist, on Flickr

Saint Louis, Missouri - I took this about 2 weeks ago. This just looks weird.

Yeah, the visors are missing, this makes the signal look flat and cartoony
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SR 228

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Re: Traffic signal
« Reply #1730 on: June 17, 2018, 01:36:47 AM »

Found this really odd U-shaped signal in Brazil, is anyone aware of how it functions? It has quite a lot of sections and has rectangular horizontal louvers.

While moving the view around in GSV and changing capture dates, I notice the sections vary in position, possibly a countdown?

GSV link: https://www.google.com/maps/@-5.7899028,-35.2051515,3a,21.4y,27.6h,100.26t/data=!3m7!1e1!3m5!1svOJtRYMXd8GMkKhekmUoDQ!2e0!5s20170901T000000!7i13312!8i6656?hl=en
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Revive 755

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Re: Traffic signal
« Reply #1731 on: June 17, 2018, 12:16:49 PM »

Came across these decorative mast arms on Streetview in Juarez, Mexico.  Link
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roadfro

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Re: Traffic signal
« Reply #1732 on: June 17, 2018, 02:48:49 PM »

Found this really odd U-shaped signal in Brazil, is anyone aware of how it functions? It has quite a lot of sections and has rectangular horizontal louvers.

While moving the view around in GSV and changing capture dates, I notice the sections vary in position, possibly a countdown?

GSV link: https://www.google.com/maps/@-5.7899028,-35.2051515,3a,21.4y,27.6h,100.26t/data=!3m7!1e1!3m5!1svOJtRYMXd8GMkKhekmUoDQ!2e0!5s20170901T000000!7i13312!8i6656?hl=en

It looks like the bottom portion of the U serves as a traditional sideways R-Y-G. From moving around in street view, it appears that the sides of the U are indeed a countdown—a second red or green ball starts somewhere up the appropriate side and gradually falls in position towards the other red/green ball at the bottom of the U, and the phase changes shortly thereafter.

That's an interesting operation, and an interesting way to provide a countdown without actually displaying numbers to the driver.
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Roadfro - AARoads Pacific Southwest moderator since 2010, Nevada roadgeek since 1983.

index

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Re: Traffic signal
« Reply #1733 on: June 17, 2018, 06:10:47 PM »

Came across these decorative mast arms on Streetview in Juarez, Mexico.  Link


That isn't too different from decorative masts you see here in some cities like downtown Tampa. They're usually a bit more bulky and have a perfect fit around the signal here though.


For reference: https://www.google.com/maps/@27.9474157,-82.4587696,3a,75y,218.65h,97.33t/data=!3m6!1e1!3m4!1s0aoc6nkYyn63VGIyDB1XZg!2e0!7i13312!8i6656
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North Carolinian born in Fairfax County, VA. Advocate for slapping an interstate shield over every single freeway and U.S. route corridor in NC.

TBKS1

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Re: Traffic signal
« Reply #1734 on: June 17, 2018, 06:49:27 PM »

Came across these decorative mast arms on Streetview in Juarez, Mexico.  Link


That isn't too different from decorative masts you see here in some cities like downtown Tampa. They're usually a bit more bulky and have a perfect fit around the signal here though.


For reference: https://www.google.com/maps/@27.9474157,-82.4587696,3a,75y,218.65h,97.33t/data=!3m6!1e1!3m4!1s0aoc6nkYyn63VGIyDB1XZg!2e0!7i13312!8i6656

And then you have this... (Downtown Little Rock) - I've posted on this thread before



A unique stoplight by TheInstrumentalist, on Flickr
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kkt

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Re: Traffic signal
« Reply #1735 on: June 18, 2018, 01:09:58 PM »

Came across these decorative mast arms on Streetview in Juarez, Mexico.  Link


That isn't too different from decorative masts you see here in some cities like downtown Tampa. They're usually a bit more bulky and have a perfect fit around the signal here though.


For reference: https://www.google.com/maps/@27.9474157,-82.4587696,3a,75y,218.65h,97.33t/data=!3m6!1e1!3m4!1s0aoc6nkYyn63VGIyDB1XZg!2e0!7i13312!8i6656

And then you have this... (Downtown Little Rock) - I've posted on this thread before



A unique stoplight by TheInstrumentalist, on Flickr

I wouldn't know what to do with that.  Go twice as fast?
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