71   General / General Discussion / AJC - HAWK pedestrian signals confuse some drivers  on: February 19, 2026, 09:34:51 AM 
Started by rjluna2 - Last post by rjluna2
Here is an article from The Atlanta Journal-Constitution that was published in November 2, 2025 at page B6:

Opinion: HAWK pedestrian signals confuse some drivers

Everyone should learn the rules of innovative new traffic signals, official say.

Doug Turnbull
Gridlock Guy

     As we have covered in earnest lately with roundabouts, the introduction of a new traffic tool or maneuver can throw drivers for a loop. Diverging diamonds and displaced left turns, each of which send drivers on the wrong side of a roadway to prevent left turns across traffic, can be confusing. This said, encountering new traffic signals can cause the same hesitation or befuddlement.

     The HAWK (high-inten-sity activated crosswalk) beacon contains a mixture of yellow and red lights and pedestrians can activate them when they are
readying to use a crosswalk. What those lights mean, however, can be confusing. One regular commuter around one of those signals in Cobb County e-mailed us some insights.

     “On GA-120/Whitlock Avenue in Marietta (west of town), there is a signalized, pedestrian activated crosswalk for the Kennesaw Mountain National Battlefield Park that uses a yellow, solid red, flashing red sequence,” driver David Becker wrote. “The style is uncommon in (Georgia) and almost all motorists seem baffled, causing confusion and lots of traffic delay on the flashing red.”

     Becker even questioned whether he knew the rules - and he thought he did. As he wrote what the rules were in our correspondence, he nailed it.

     When HAWK signals are unlit, drivers should simply proceed past them at a normal speed. When a pedestrian prepares to cross and presses the button, yellow lights activate.

     Yellow on a HAWK signal means the same thing that it signifies on a regular traffic light: Drivers should begin to slow and prepare for that signal to turn red. The yellow light is the single bulb on the bottom row of a HAWK. When the red lights illuminate in the two lamps on the top row, all vehicular traffic must stop.

     This is also the signal for pedestrians to safely proceed into the crosswalk, as they receive a “walk” signal on the signs facing them.
     Traffic under the auspices of those solid red lights must remain stopped for the entirety of that cycle, regardless of where the person is in the
crosswalk.

     Once the vehicle signals change and start flashing red, drivers can proceed across the crosswalk if it is empty in front of them and once they first stop. This creates a slow buffer between cars and unprotected people, before the signals turn off and traffic resumes normally.

     Becker’s concern with the signal on Whitlock Avenue was that people were stopping too long or unnecessarily. Signs indicate that drivers must stop on red, which is universally true. But Becker said that some will stay stopped in the HAWK crosswalk when the red lights are flashing. He said they are slow to drive forward after stopping. I raised this point with Cobb County officials.

     “We encourage all residents to familiarize themselves with the HAWK signal operation and to always remain alert and cautious at crosswalks,” spokesperson Ross Cavitt told llAlive and The Atlanta Journal-Constitution. And he extolled the system’s virtues.

     “This system increases pedestrian visibility, reduces crashes, and ensures smoother traffic operation,” he said. As for the idea of drivers near Kennesaw Mountain superfluously coming to a stop: “HAWK beacons minimize unnecessary stops for drivers while giving priority to pedestrian safety when needed,” Cavitt said.

     HAWKs make a person crossing more visible to drivers, and do so in an orderly way. For crosswalks without signals, traffic must stop immediately any time a pedestrian enters them. HAWK beacons have people wait until traffic can slow down and then allow it to cautiously resume. And people have to wait to be told to walk, instead of just going for it.

     So, much like with roundabouts – which allow traffic to continue a flow - HAWKs prompt all traffic to stop at once and then proceed, slowly, in
unison.

     When I took my driver’s test as a 16-year-old, the driving instructor actually docked me points for being too cautious. For fear of violating crosswalk rules, I stopped in every single crosswalk on our road test, regardless of there being pedestrians or not. After the third or fourth time of extra pause, the instructor reminded me of the law. When crosswalks are empty, without signals, and without signage stating otherwise, drivers do not have to stop.

     HAWK signals make the presence of pedestrians more clear. Drivers should proceed with caution on yellow, stop completely on solid red, and first stop and then go ahead slowly on flashing reds. Once the vapor lock of confusion clears, traffic and people can go forward more safely and efficiently.

Doug Turnbull covers the traffic/transportation beat for WXIA-TV (llAlive). His reports appear on the llAlive Morning News from 6 a.m. to 9 a.m. and on llAlive.
 72   General / General Discussion / EOL Protection Questions  on: February 19, 2026, 08:58:14 AM 
Started by Emersyn - Last post by Emersyn
I have a few questions about EOL protection:

-On some ballasts EOL protection kicks in if an arc can't strike within a few seconds, why is that?

-On some other ballasts, EOL protection takes a few minutes to kick in; the EOL tube will go EOL for a little bit, and then the ballast seems to do something and the tube kind of dies down until it's  either glowing very dimly or doing nothing, why is that?

-What exactly is the EOL protection circuit? Does it just simpily cut out a bad lamp?

-Why do some ballasts have/not have protection?
 73   General / Off-Topic / Re: What is your favorite vintage car?  on: February 19, 2026, 07:27:35 AM 
Started by Burrito - Last post by rjluna2
:laugh:
 74   Lamps / Modern / Germicidal lamps that don't produce UV  on: February 19, 2026, 12:36:16 AM 
Started by LightsAreBright27 - Last post by LightsAreBright27

I remember that some people wanted clear fluorescent lamps, that don't produce UV. I found a fake lamp, that doesn't use quartz glass, so doesn't produce UV-C.

I have 2 germicidal lamps, a real philips G6T5, and a fake "philips" G6T5.


The real lamp was bought at an authorized philips distributor, and came in a thin polystyrene sleeve with warnings all over it. The fake lamp was included with a ballast for free, and came with no sleeve.


The fake lamp didn't even have crimps on the pins, so the lamp didn't work at first. I had to put some solder in the pins to even make it work.
Also, the etch of the fake lamp rubbed off easily.


Then, I noticed a color difference between the real and fake lamp, especially when I kept it on paper. I noticed that the real lamp made the paper glow blue (due to fluorescence) while the fake lamp made the paper glow cyan (just like the lamp itself).


Then I used a UV-C test card. The real lamp made the test card glow green, while the fake one didn't.


I have come to the conclusion that the fake lamp actually doesn't use quartz glass, and is just normal glass. The fake lamp is the equivalent of clearing the phosphor from a normal tube. That means no UV-C comes out of it.
 75   General / Off-Topic / Re: What is your favorite vintage car?  on: February 18, 2026, 10:38:12 PM 
Started by Burrito - Last post by Econolite03
Be sure to fix the cigarette lighter.
 76   General / General Discussion / Re: LPS / SOX Lamp Sodium Resistant Pinch Seal Specifics  on: February 18, 2026, 06:32:18 PM 
Started by Multisubject - Last post by Multisubject
I also know that a Kovar alloy was used for most hard glass SOX discharge tubes, were they ever made with the harder ~3.3e-6 borosilicate and tungsten?
 77   General / General Discussion / Re: PF before capacitor failure  on: February 18, 2026, 02:54:28 PM 
Started by Emersyn - Last post by Ash
There is no single way how a HP Fluorescent circuit can be implemented, and each circuit will behave differently. Some possible behaviors may include :

The lamp current going down as the capacitor value is going down, while some other current draw in the circuit (the filament heating, the ballast primary winding losses, etc) remains unchanged. So while the phase angle of the current component affected by the capacitor may be going more and more like 90deg (towards capacitive), at the same time its effect is becoming less significant for the complete ballast PF which is seen from the line outside, so the PF of that one stays high

The lamp current not changing, but ballast primary current is rising and along with it the ballast's resistive losses, which pull the PF towards unity. Within some range of capacitor value (as it is failing), it is possible that the change in PF (towards inductive) is masked by the increasing "resistive" component of the current

The capacitor is parallel to the line input, and not actually part of the ballast circuit (even if it is hidden inside the ballast enclosure). The change in PF (towards inductive) will be clearly visible
 78   General / General Discussion / PF before capacitor failure  on: February 18, 2026, 01:58:50 PM 
Started by Emersyn - Last post by Emersyn
Will a ballast with a capacitor that is going bad have a lower PF?

I had one that even when it was showing signs of failing had a near perfect PF (0.99)
 79   General / General Discussion / Re: Residential vs Commercial Fluorescent Ballasts  on: February 18, 2026, 08:59:01 AM 
Started by Multisubject - Last post by Ash
All luminaires compared are ceiling installation, and all really have no diffuser or any type

The Fluorescent ones with bare tubes (36W T8 or 54W T5) are installed flat on the ceiling, at about 2.5m height

The LED ones with bare visible individual LED dies are often in the form of dangling chandeliers, those are often installed in newer houses with higher ceiling, but the actual light emitters are hanging at about the same 2.5m

Many of the LED ones are only counting on isolated LED drivers for the safety, some are questionable at that too (output Voc exceeds SELV limits, bad clearance distances on the PCB or inside the transformer insulation are common)
 80   General / Off-Topic / Re: What is your favorite vintage car?  on: February 18, 2026, 07:28:16 AM 
Started by Burrito - Last post by rjluna2
The car the Blue Brothers drove.
Yep, this 1974 Dodge Monaco :)
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