Planes fly high in the sky. Sometimes they fly close to each other. This can be dangerous. There is a special system to help planes stay safe. This system is called TCAS. TCas helps planes not crash into each other. Big planes that carry many people must have TCAS. Small planes with less people may have a simpler version. TCas talks to a box in the plane called a transponder. The transponder tells TCAs where other planes are. In new planes, pilots can see TCAS on their screens. In old planes, they might have a special TCAS screen. People have been trying to make planes safe for a long time. They want to make sure planes do not crash in the sky. The TCAS is one way to do this. It helps pilots know where other planes are and stay away from them.

In India, all cars and bikes on the road need to have a special number. This number is given by an office called the RTO. The number is written on number plates that must be put on the front and back of the vehicle. The numbers and letters on the plate must be certain types. Each car's number is special. It has four parts. The first part is two letters that show the state. The second part is two numbers that show the area. The third part has letters for the RTO's code. The last part is a number from 1 to 9999 that is only for that car. This way, you can know where the car is from.

Some people help cars and people move safely when there are problems on the road. These problems can be because of road work, accidents or other things that change the regular way roads are used. These helpers try to keep everyone safe, including people who work on the roads, the people driving, and those walking. These helpers use cameras and other tools to watch the roads. They help cars move better when there are too many cars on the road or when there is something wrong. The helpers hold big signs. The signs look like lollipops. They say "Stop" or "Slow." Sometimes, these helpers work near schools to help children cross the road safely. These helpers work outside. They work in the day and the night. They work even if the weather is not good. Their job can be dangerous because cars go very fast. They must be careful and wear safe clothes. If they are very tired, their job can be harder. The helpers put signs on the road before the work area. These signs help drivers know what to do. The signs might tell drivers to drive slower or to get ready to stop. Sometimes, the helpers are in danger because some drivers do not look at the road or are using their phones. It is very important for all drivers to pay attention and follow the signs to keep everyone safe.