Much like the Marlow cone incident, cones are being found atop streetlamps in Milton Keynes. This time, it's a serial cone placer.
The individual behind this incident has been at it since midway through last year. Electric scooters and bicycles have also been found atop streetlamps.

Another one. Nobody's seen anyone go up there with a cone, and current theories suggest drone use. Again, stop putting cones on streetlamps! They can't get down!!

Orange cones were spotted balanced atop streetlamps in Marlow around the end of January. The cones were found on several different roads, and it is unclear how they got up there.
Buckinghamshire (buck'n'm-sheer for you non-Brits) Council has made moves to "remove" the cones after many reports.
Local Council member Steven Broadbent confirmed the reports, mentioning that they posed a major risk, both to those placing them up there and those the cones may potentially fall on. Removal of the cones also required crew members who were otherwise occupied with more important tasks around the town.
He did not, however, comment on the danger to the cones themselves, or where they were being relocated to.

...Don't put cones up streetlamps, kids. It's a hazard to everyone, including the cones. Their bases end up exposed to the elements, and they might not land upright - or worse, may land on a person or even a moving vehicle.

The California Department of Transportation, or Caltrans HQ, reposted a video from Gabriele Corno, dated December 2022, showing a wild black bear uprighting a cone.
The video in question was further reposted by at least nine different news sites. Something tells me news is quite slow for all ten involved parties.

Though this is old news, it is in fact a reminder that other animals recognise cones the way they would any other creature. Cones will be uprighted the same way that an upside down turtle or tortoise will be flipped back to its correct orientation.

An individual has, somehow, managed to remove over six hundred cones from a 2km (1.24 mile) stretch of road in Stretford.

The cones had been delivered to the area as early as May 2020, and had remained in the area until they were removed on the 10th.

The cones were intended to mark out temporary cycle lanes to "aid social distancing" by the council. However, local residents were not happy that the cones - which are typically used as a temporary marker - were being used as a permanent solution. Petitions circled, but little was done.
The resulting anger supposedly led to the removal of these cones by a local, though details remain vague. Police were notified, and the cones have since been "replaced" by officials, though authorities did not make it clear whether they had located the removed cones or if this was a new pack of cones.

Everyone is at fault here. For one, the cones should not have been left there in the first place if they were going to become an invasive nuisance. There should have been a more permanent solution at least two years ago.
I also agree with the anger of the residents, but uprooting what is now an integrated local species is not a valid solution!

Driverless taxis in San Francisco can be effectively disabled by placing a cone on the hood. This is being used to protest automatic taxi services in the area.
The cone interferes with the car's detection systems - after all, if there were someone on the hood of your car, you wouldn't drive off.
The protests appear to oppose the companies operating the taxis:

• Vehicles from Cruise are reported driving destructively, with little regard for uncommon roadblocks such as hoses and power lines.
• Vehicles from Waymo have been reported to refuse to pull over when investigated by police.
• Neither company's cars seem to handle buses very well.
• Concerns have arisen regarding the environmental impact of these vehicles, relating to emissions from battery manufacture and tire wear.

The group reportedly behind this incident - SafeStreetRebel - suggest that the cars promote poor management of roads and traffic control systems by local officials: rather than actually deal with the problem, authorities are just allowing the entire issue to be automated.

Personally, I just think the cones don't want to be run over by Cruise vehicles.

Mayor Wayne Brown of Auckland, NZ, has openly and actively referred to cones as "useless".
The following tweet was made on June 30:

This man has reportedly been on the warpath about cones as far back as March.

70% of the votes pledged allegiance to the aforementioned traffic cones. Only 1% revealed that they would be reporting cones to the local government for removal.
The replies to this tweet are filled with a mixture of mayor-aimed insults and images/recounts showing appreciation for the cones.

I can't see this going well for him. I don't know where I stand with cones, but I at least make sure to pick them up if they've fallen over. I don't want them to come after me.

A giant cone (dubbed henceforth C. conus gigantis) has appeared in a cluster in the middle of the Washington Avenue/Constance Street intersection in (i THINK) New Orleans, Louisiana.
The immense cone has amassed an almost unheard-of mixed-species cluster composed of itself, four barrels, two bollards and a common cone, all of which are orange.

This cone was reported by NOLA and uploaded to Youtube on March 24. It supposedly reaches 8 feet tall, and has claimed a small to medium sized pothole as its territory.

The cone has since been relocated, as its territory posed a major risk to its own safety and that of local cars.

UPDATE: Tracking the Street View of the area back to February shows three members of the cluster inhabiting the general pothole area. It appears the cluster's smaller members were local to the area before the clearly-dominant large cone came into the scene. It is unclear where they have been moved to, though - no reports of a massive cone have shown up in the wild yet.