Have you ever ridden on a bus or a train and noticed that there are some things that always stay in the same spot? These things are called fixed objects! They are usually things like poles or signs that you can hold onto or read from your seat.
Sometimes, it's important for the people who run the bus or train to know where these fixed objects are, so they can make sure everyone stays safe. For example, if there is a bump in the road, the driver might need to make sure that nobody falls over or gets hurt.
To help with this, some public transport systems have cameras or sensors that can identify where these fixed objects are. The cameras take pictures or videos of the area and then a computer program analyzes them to figure out where the fixed objects are located. Once the computer knows where the objects are, it can help the driver know where to slow down or be extra careful.
So, the identification of fixed objects in public transport helps keep us all safe when we're riding the bus or train!