Most Traffic Lights on a Standard Mast Arm

[stevenliu96]

The most I've seen is seven.

Mills Civic Parkway & Jordan Creek Parkway in West Des Moines, IA
https://www.instagram.com/p/CD_a9LGlsr6/?utm_source=ig_web_copy_link

[ozarkman417]

Six on the front, two in back
Eight total.

[STLmapboy]

There are plenty of sevens: here are Las Vegas and Atlanta examples. Eights are a bit harder.

[Ned Weasel]

Sheesh, poor Olathe, Kansas only having six: https://goo.gl/maps/1xedpbqhaXe9FCvn6 .  Like, hello, are we even trying over here?

[stevenliu96]

There are plenty of sevens: here are Las Vegas and Atlanta examples. Eights are a bit harder.

I'm originally from California where even four traffic lights on a mast arm is rare.

[EpicRoadways]

Nine on this massive arm in Buffalo, MN.

[tradephoric]

This SPUI outside of Columbus has 13 signal heads along the mast arm: 
https://www.google.com/maps/@40.0817261,-82.8956612,3a,75y,206.08h,98t/data=!3m6!1e1!3m4!1s1V6tDzBn2MR-u5W87_REBw!2e0!7i16384!8i8192

[kphoger]

This SPUI outside of Columbus has 13 signal heads along the mast arm: 
https://www.google.com/maps/@40.0817261,-82.8956612,3a,75y,206.08h,98t/data=!3m6!1e1!3m4!1s1V6tDzBn2MR-u5W87_REBw!2e0!7i16384!8i8192

The question, though, is this:  Is that a "standard mast arm"?

[stevenliu96]

This SPUI outside of Columbus has 13 signal heads along the mast arm: 
https://www.google.com/maps/@40.0817261,-82.8956612,3a,75y,206.08h,98t/data=!3m6!1e1!3m4!1s1V6tDzBn2MR-u5W87_REBw!2e0!7i16384!8i8192

The question, though, is this:  Is that a "standard mast arm"?

The original idea I had in mind was the most traffic signals facing the same direction on a standard (non-diagonal across the intersection type) mast arm.

[kphoger]

In that case, I don't think any of the suggestions so far has topped seven.

[stevenliu96]

In that case, I don't think any of the suggestions so far has topped seven.

Yeah, well seven is the most I've seen. The Las Vegas ones were also seven.
https://www.google.com/maps/@36.1082687,-115.1728559,3a,65.8y,350.4h,103.58t/data=!3m7!1e1!3m5!1sYg0h3L0oafCkqCV3wgCOcQ!2e0!5s20180801T000000!7i16384!8i8192

https://www.google.com/maps/@36.1087763,-115.1728459,3a,39.2y,4.61h,98.37t/data=!3m7!1e1!3m5!1srD-6uq-f2r4kchZqLrr8pQ!2e0!5s20200301T000000!7i16384!8i8192

However, if this thread is going the diagonal across the intersection direction, there's a 18 traffic light set up at this intersection in Dubuque, IA.
https://www.google.com/maps/@42.4920391,-90.6656137,3a,75y,125.39h,90.6t/data=!3m6!1e1!3m4!1sjp41_3toR6SSIvg5Svcu2g!2e0!7i16384!8i8192

[STLmapboy]

In that case, I don't think any of the suggestions so far has topped seven.

Yeah, well seven is the most I've seen. The Las Vegas ones were also seven.
https://www.google.com/maps/@36.1082687,-115.1728559,3a,65.8y,350.4h,103.58t/data=!3m7!1e1!3m5!1sYg0h3L0oafCkqCV3wgCOcQ!2e0!5s20180801T000000!7i16384!8i8192

https://www.google.com/maps/@36.1087763,-115.1728459,3a,39.2y,4.61h,98.37t/data=!3m7!1e1!3m5!1srD-6uq-f2r4kchZqLrr8pQ!2e0!5s20200301T000000!7i16384!8i8192

However, if this thread is going the diagonal across the intersection direction, there's a 18 traffic light set up at this intersection in Dubuque, IA.
https://www.google.com/maps/@42.4920391,-90.6656137,3a,75y,125.39h,90.6t/data=!3m6!1e1!3m4!1sjp41_3toR6SSIvg5Svcu2g!2e0!7i16384!8i8192

I like the extended visors on the Vegas ones. What's the name for those again?

[MCRoads]

Well, if masts supported at both ends are fair game, this one in Tampa has 19!

Florida is king in this department, they have many large diagonal intersections with setups like this.

[paulthemapguy]

Found an 8 down the street from the 7 posted earlier by Atlanta:

https://goo.gl/maps/Mm5c6wsLxJkaRNiZA

[webny99]

Would this count as seven?
If so, then there's plenty of similar examples along this entire corridor.

[kphoger]

Guys, please see the bolded portion below.

We're still at seven.

The original idea I had in mind was the most traffic signals facing the same direction on a standard (non-diagonal across the intersection type) mast arm.

Of course, we've started talking about other things too, specifically corner-to-corner installations.  But, if you're trying to find a winner for a "standard mast arm", then you need to make sure they're all facing the same direction of traffic.

[stevenliu96]

In that case, I don't think any of the suggestions so far has topped seven.

Yeah, well seven is the most I've seen. The Las Vegas ones were also seven.
https://www.google.com/maps/@36.1082687,-115.1728559,3a,65.8y,350.4h,103.58t/data=!3m7!1e1!3m5!1sYg0h3L0oafCkqCV3wgCOcQ!2e0!5s20180801T000000!7i16384!8i8192

https://www.google.com/maps/@36.1087763,-115.1728459,3a,39.2y,4.61h,98.37t/data=!3m7!1e1!3m5!1srD-6uq-f2r4kchZqLrr8pQ!2e0!5s20200301T000000!7i16384!8i8192

However, if this thread is going the diagonal across the intersection direction, there's a 18 traffic light set up at this intersection in Dubuque, IA.
https://www.google.com/maps/@42.4920391,-90.6656137,3a,75y,125.39h,90.6t/data=!3m6!1e1!3m4!1sjp41_3toR6SSIvg5Svcu2g!2e0!7i16384!8i8192

I like the extended visors on the Vegas ones. What's the name for those again?

On McCain's website it just says "45° Angle".
https://mccain-inc.com/images/mccain-files/products/cut-sheets/Signals/Signal_Visors.pdf

[jakeroot]

Very difficult to answer for WA.

In order to really have a lot of traffic lights, it helps to have at least a triple left turn. There's only three triple left turns that I know of, and two of those use two overhead and a third supplemental signal not on the mast arm (either far left of intersection or near-side on the opposing direction's mast arm); the third is span wire. Of those approaches, only one has three through lanes. At any rate, we're at five signals (two left, three through).

There's a few approaches with four through lanes, but all have only a single left turn. Again: five signals.

There are wide California-esque roads in cities like Spokane or Federal Way, but both employ supplemental signals instead of signal-per-lane strategies, so none have any installations with a bunch of overhead signals.

The other problem is that double right turns are almost always via slip lanes, so those extra signals are always a separate mast arm or pole.

So yeah, I'm putting Washington down as "five". Every approach with more than five lanes employs, at the very least, some supplemental signals or "through minus one" strategies.