Nobody asked but those red steel posts are rescue equipment. They are not steel but rather air craft grade aluminum. They are rated for 40,000 lbs in a vertical orientation and 18,000 pounds in a horizontal orientation.
They are extended by pressurized air and then a pin is inserted. The air is released and the pin holds the two portions of the post. There are a wide variety of ends that can be put on the posts depending on the particular use. The ends are held in place with a pin similar to the pin to hold your trailer hitch to the receiver hitch. Ends include swivels, flat, u clamp, spikes, and etc.
They posts come in a variety of lengths as short as 18 inches up to 8 feet in closed position. They open to about 6 inches less than double their closed position.
They are known as "Airshores" and the FEMA USAR (Urban Search and Rescue) teams that respond to such events as 911 have a wide assortment of them.
Rescue squads use them in a horizontal position to support the walls during a trench rescue. They are used in a vertical position to support buildings during building collapse rescue. They are used in a diagonal position to support cars and truck during vehicle rescue.
They are not your standard steel columns from the box store.
Picture from inside of rescue trailer. Airshores stored on right side
Airshores in use during a trench rescue. These are older models and are not red, just natural aluminum.
Here is an example of how they might be used in vehicle stabilization
3 airshores with a special adapter plate used to form a tripod during a confined space rescue training inside a fuel tanker.