I noticed in Florida, in the event of a power outage the traffic signals simply go out. Drivers dont seem to treat them as stop signs so a policeman is required to direct traffic.

Around here, it varies! If it goes out completely...police gets involved......There may be some systems that have battery packs.....but some don't....

I recall the traffic lights here simply going out when they lose power and drivers are expected to treat them as a 4 way stop but most of the busier streets need police involvement to direct traffic.

Many of the batteries are in need of replacement now, they last about 3-5 years. sometimes only one will fail and show a full voltage but dies under load. We found a few intersections in need of batteries during our last inspection.

That is the responsiblity of maintaing UPS box by replacing those batteries. I have 5 UPS is being used at home for each computers at home (2, my father, 1, my mother and 2 for myself). One at work

UPS maintenance is expensive when you replace batteries that are aging, especially with the UPS at work, that uses a half gross of 7AH SLA cells.

The UPS in my office is older tech, uses 3 car batteries in series, or now 36 of the best of the other ups batteries in a series/parallel stack.

here when the power goes out, the signals go completly out.

There's a few controllers here with a additional box on the cabinet which I'm guessing is a backup battery.

Our newer cabinets have transfer switches mounted to the side of the cabinet

I noticed here when the power goes out the signal goes dark, but some signals will go into flashing mode when the power comes back after it's out for a while while others will resume their normal operation.

depends on how the cabinet is programmed for start up state...usually all-red, or flashing for a minute or so before going into normal operation. Going straight into operation seems like a unique thing. My cabinet is set for 30 seconds of flashing red in all directions before going into normal operation following powerup.

The ones i'm referring to will continue to flash for up to a week if the power outage is long enough. I'm not sure if they eventually go back to normal on their own or if a worker has to reset it or something...

A lengthy flash state is due to a tripped conflict monitor that needs the brownout fault reset by a technician. Newer models of monitors self reset for power outages.

They could be on flash because no one reported them. Another problem is that the line to the cabinet suffered severe over voltage such as a lightning strike or a primary (2-16kV) touched the 120v line. Rain water may have shorted across two colors tripping the MMU / CMU, and the intersection was now a large one, and not a priority compared to others.

I like LED traffic lights .

There are now 2 sets of lights in the city with solar powering, using battery packs and inverters. I do not know how they are wired, but I think they have grid tie inverters driving a standard large ups as they do say they feed power to the grid.

Would be nice if Eishkom allowed grid tie inverters to be connected, it would make life easy to add solar electricity to a house.

I replaced a bypass switch in a BBS like this. It is the rotary switch in the upper right. Also some more batteries have failed and will have to be replaced.

We had problems now - had several of these vandalized and batteries stolen, we since put on heavier locks.

Is the lead price up again, that is normally what happens to those cells, sold for scrap value.

Some junctions here in Israel, have UPSs for the traffic lights, but otherwise, the traffic lights goes out in power outages.